Cybersecurity news can sometimes feel like a never-ending horror movie, can't it? Just when you think the villains are locked up, a new threat emerges from the shadows.
This week is no exception, with tales of exploited flaws, international espionage, and AI shenanigans that could make your head spin. But don't worry, we're here to break it all down in plain English and arm you with the

Cyber Security / Hacking News

Cybersecurity news can sometimes feel like a never-ending horror movie, can't it? Just when you think the villains are locked up, a new threat emerges from the shadows.

This week is no exception, with tales of exploited flaws, international espionage, and AI shenanigans that could make your head spin. But don't worry, we're here to break it all down in plain English and arm you with the knowledge you need to stay safe.

So grab your popcorn (and maybe a firewall), and let's dive into the latest cybersecurity drama!

**⚡ Threat of the Week**

**Critical Fortinet Flaw Comes Under Exploitation:** Fortinet revealed that a critical security flaw impacting FortiManager (CVE-2024-47575, CVSS score: 9.8), which allows for unauthenticated remote code execution, has come under active exploitation in the wild. Exactly who is behind it is currently not known. Google-owned Mandiant is tracking the activity under the name UNC5820.

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How to implement a container security solution and **Kubernetes Security best practices** all rolled into one. This guide includes everything essential to know about building a strong security foundation and running a well-protected operating system.

Get the Guide**️🔥 Trending CVEs**

CVE-2024-41992, CVE-2024-20481, CVE-2024-20412, CVE-2024-20424, CVE-2024-20329, CVE-2024-38094, CVE-2024-8260, CVE-2024-38812, CVE-2024-9537, CVE-2024-48904

**🔔 Top News**

*   **Severe Cryptographic Flaws in 5 Cloud Storage Providers:** Cybersecurity researchers have discovered severe cryptographic issues in end-to-end encrypted (E2EE) cloud storage platforms Sync, pCloud, Icedrive, Seafile, and Tresorit that could be exploited to inject files, tamper with file data, and even gain direct access to plaintext. The attacks, however, hinge on an attacker gaining access to a server in order to pull them off.
*   **Lazarus Exploits Chrome Flaw:** The North Korean threat actor known as Lazarus Group has been attributed to the zero-day exploitation of a now-patched security flaw in Google Chrome (CVE-2024-4947) to seize control of infected devices. The vulnerability was addressed by Google in mid-May 2024. The campaign, which is said to have commenced in February 2024, involved tricking users into visiting a website advertising a multiplayer online battle arena (MOBA) tank game, but incorporated malicious JavaScript to trigger the exploit and grant attackers remote access to the machines. The website was also used to deliver a fully-functional game, but packed in code to deliver additional payloads. In May 2024, Microsoft attributed the activity to a cluster it tracks as Moonstone Sleet.
*   **AWS Cloud Development Kit (CDK) Account Takeover Flaw Fixed:** A now-patched security flaw impacting Amazon Web Services (AWS) Cloud Development Kit (CDK) could have allowed an attacker to gain administrative access to a target AWS account, resulting in a full account takeover. Following responsible disclosure on June 27, 2024, the issue was addressed by Amazon in CDK version 2.149.0 released in July 2024.
*   **SEC Fines 4 Companies for Misleading SolarWinds Disclosures:** The U.S. Securities and Exchange Commission (SEC) charged four public companies, Avaya, Check Point, Mimecast, and Unisys, for making "materially misleading disclosures" related to the large-scale cyber attack that stemmed from the hack of SolarWinds in 2020. The federal agency accused the companies of downplaying the severity of the breach in their public statements.
*   **4 REvil Members Sentenced in Russia:** Four members of the now-defunct REvil ransomware operation, Artem Zaets, Alexei Malozemov, Daniil Puzyrevsky, and Ruslan Khansvyarov, have been sentenced to several years in prison in Russia. They were originally arrested in January 2022 following a law enforcement operation by Russian authorities.

**📰 Around the Cyber World**

*   **Delta Air Lines Sues CrowdStrike for July Outage:** Delta Air Lines filed a lawsuit against CrowdStrike in the U.S. state of Georgia, accusing the cybersecurity vendor of breach of contract and negligence after a major outage in July caused 7,000 flight cancellations, disrupted travel plans of 1.3 million customers, and cost the carrier over $500 million. "CrowdStrike caused a global catastrophe because it cut corners, took shortcuts, and circumvented the very testing and certification processes it advertised, for its own benefit and profit," it said. "If CrowdStrike had tested the Faulty Update on even one computer before deployment, the computer would have crashed." CrowdStrike said "Delta's claims are based on disproven misinformation, demonstrate a lack of understanding of how modern cybersecurity works, and reflect a desperate attempt to shift blame for its slow recovery away from its failure to modernize its antiquated IT infrastructure."
*   **Meta Announces Secure Way to Store WhatsApp Contacts:** Meta has announced a new encrypted storage system for WhatsApp contacts called Identity Proof Linked Storage (IPLS), allowing users to create and save contacts along with their usernames directly within the messaging platform by leveraging key transparency and hardware security module (HSM). Until now, WhatsApp relied on a phone's contact book for syncing purposes. NCC Group, which carried out a security assessment of the new framework and uncovered 13 issues, said IPLS "aims to store a WhatsApp user's in-app contacts on WhatsApp servers in a privacy-friendly way" and that "WhatsApp servers do not have visibility into the content of a user's contact metadata." All the identified shortcomings have been fully fixed as of September 2024.
*   **CISA, FBI Investigating Salt Typhoon Attacks:** The U.S. Cybersecurity and Infrastructure Security Agency (CISA) said the U.S. government is investigating "the unauthorized access to commercial telecommunications infrastructure" by threat actors linked to China. The development comes amid reports that the Salt Typhoon hacking group broke into the networks of AT&T, Verizon, and Lumen. The affected companies have been notified after the "malicious activity" was identified, CISA said. The breadth of the campaign and the nature of information compromised, if any, is unclear. Multiple reports from The New York Times, The Wall Street Journal, Reuters, Associated Press, and CBS News have claimed that Salt Typhoon used their access to telecommunications giants to tap into phones or networks used by Democratic and Republican presidential campaigns.
*   **Fraudulent IT Worker Scheme Becomes a Bigger Problem:** While North Korea has been in the news recently for its attempts to gain employment at Western companies, and even demanding ransom in some cases, a new report from identity security company HYPR shows that the employee fraud scheme isn't just limited to the country. The company said it recently offered a contract to a software engineer claiming to be from Eastern Europe. But subsequent onboarding and video verification process raised a number of red flags about their true identity and location, prompting the unnamed individual to pursue another opportunity. There is currently no evidence tying the fraudulent hire to North Korea, and it's not clear what they were after. "Implement a multi-factor verification process to tie real world identity to the digital identity during the provisioning process," HYPR said. "Video-based verification is a critical identity control, and not just at onboarding."
*   **Novel Attacks on AI Tools:** Researchers have uncovered a way to manipulate digital watermarks generated by AWS Bedrock Titan Image Generator, making it possible for threat actors to not only apply watermarks to any image, but also remove watermarks from images generated by the tool. The issue has been patched by AWS as of September 13, 2024. The development follows the discovery of prompt injection flaws in Google Gemini for Workspace, allowing the AI assistant to produce misleading or unintended responses, and even distribute malicious documents and emails to target accounts when users ask for content related to their email messages or document summaries. New research has also found a form of LLM hijacking attack wherein threat actors are capitalizing on exposed AWS credentials to interact with large language models (LLMs) available on Bedrock, in one instance using them to fuel a Sexual Roleplaying chat application that jailbreaks the AI model to "accept and respond with content that would normally be blocked" by it. Earlier this year, Sysdig detailed a similar campaign called LLMjacking that employs stolen cloud credentials to target LLM services with the goal of selling the access to other threat actors. But in an interesting twist, attackers are now also attempting to use the stolen cloud credentials to enable the models, instead of just abusing those that were already available.

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**🛡️Ask the Expert**

**Q:** What is the most overlooked vulnerability in enterprise systems that attackers tend to exploit?

**A:** The most overlooked vulnerabilities in enterprise systems often lie in IAM misconfigurations like over-permissioned accounts, lax API security, unmanaged shadow IT, and poorly secured cloud federations. Tools like Azure PIM or SailPoint help enforce least privilege by managing access reviews, while Kong or Auth0 secure APIs through token rotation and WAF monitoring. Shadow IT risks can be reduced with Cisco Umbrella for app discovery, and Netskope CASB for enforcing access control. To secure federations, use Prisma Cloud or Orca to scan settings and tighten configurations, while Cisco Duo enables adaptive MFA for stronger authentication. Finally, safeguard service accounts with automated credential management through HashiCorp Vault or AWS Secrets Manager, ensuring secure, just-in-time access.

**🔒 Tip of the Week**

**Level Up Your DNS Security:** While most people focus on securing their devices and networks, the Domain Name System (DNS)—which translates human-readable domain names (like example.com) into machine-readable IP addresses—is often overlooked. Imagine the internet as a vast library and DNS as its card catalog; to find the book (website) you want, you need the right card (address). But if someone tampered with the catalog, you could be misled to fake websites to steal your information. To enhance DNS security, use a privacy-focused resolver that doesn't track your searches (a private catalog), block malicious sites using a "hosts" file (rip out the cards for dangerous books), and employ a browser extension with DNS filtering (hire a librarian to keep an eye out). Additionally, enable DNSSEC to verify the authenticity of DNS records (verify the card's authenticity) and encrypt your DNS requests using DoH or DoT (whisper your requests so no one else can hear).

**Conclusion**

And there you have it – another week's worth of cybersecurity challenges to ponder. Remember, in this digital age, vigilance is key. Stay informed, stay alert, and stay safe in the ever-evolving cyber world. We'll be back next Monday with more news and insights to help you navigate the digital landscape.

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THN Cybersecurity Recap: Top Threats, Tools and News (Oct 21 - Oct 27)

Cybersecurity researchers have warned of a spike in phishing pages created using a website builder tool called Webflow, as threat actors continue to abuse legitimate services like Cloudflare and Microsoft Sway to their advantage.
"The campaigns target sensitive information from different crypto wallets, including Coinbase, MetaMask, Phantom, Trezor, and Bitbuy, as well as login credentials for

Cybersecurity researchers have warned of a spike in phishing pages created using a website builder tool called Webflow, as threat actors continue to abuse legitimate services like Cloudflare and Microsoft Sway to their advantage.

"The campaigns target sensitive information from different crypto wallets, including Coinbase, MetaMask, Phantom, Trezor, and Bitbuy, as well as login credentials for multiple company webmail platforms, as well as Microsoft 365 login credentials," Netskope Threat Labs researcher Jan Michael Alcantara said in an analysis.

The cybersecurity company said it tracked a 10-fold increase in traffic to phishing pages crafted using Webflow between April and September 2024, with the attacks targeting more than 120 organizations across the world. A majority of those targeted are located in North America and Asia spanning financial services, banking, and technology sectors.

The attackers have been observed using Webflow to create standalone phishing pages, as well as to redirect unsuspecting users to other phishing pages under their control.

"The former provides attackers stealth and ease because there are no phishing lines of code to write and detect, while the latter gives flexibility to the attacker to perform more complex actions as required," Michael Alcantara said.

What makes Webflow a lot more appealing than Cloudflare R2 or Microsoft Sway is that it allows users to create custom subdomains at no additional cost, as opposed to auto-generated random alphanumeric subdomains that are prone to raise suspicion -

*   Cloudflare R2 - https://pub-<32\_alphanumeric\_string>.r2.dev/webpage.htm
*   Microsoft Sway - https://sway.cloud.microsoft/{16\_alphanumeric\_string}?ref={sharing\_option}

In an attempt to increase the likelihood of success of the attack, the phishing pages are designed to mimic the login pages of their legitimate counterparts in order to deceive users into providing their credentials, which are then exfiltrated to a different server in some instances.

Netskope said it also identified Webflow crypto scam websites that use a screenshot of a legitimate wallet homepage as their own landing pages and redirect the visitor to the actual scam site upon clicking anywhere on the bogus site.

The end goal of the crypto-phishing campaign is to steal the victim's seed phrases, allowing the attackers to hijack control of the cryptocurrency wallets and drain funds.

In the attacks identified by the cybersecurity firm, users who end up providing the recovery phrase are displayed an error message stating their account has been suspended due to "unauthorized activity and identification failure." The message also prompts the user to contact their support team by initiating an online chat on tawk.to.

It's worth noting that chat services such as LiveChat, Tawk.to, and Smartsupp have been misused as part of a cryptocurrency scam campaign dubbed CryptoCore by Avast.

"Users should always access important pages, such as their banking portal or webmail, by typing the URL directly into the web browser instead of using search engines or clicking any other links," Michael Alcantara said.

The development comes as cybercriminals are advertising novel anti-bot services on the dark web that claim to bypass Google's Safe Browsing warnings on the Chrome web browser.

"Anti-bot services, like Otus Anti-Bot, Remove Red, and Limitless Anti-Bot, have become a cornerstone of complex phishing operations," SlashNext said in a recent report. "These services aim to prevent security crawlers from identifying phishing pages and blocklisting them."

"By filtering out cybersecurity bots and disguising phishing pages from scanners, these tools extend the lifespan of malicious sites, helping criminals evade detection longer."

Ongoing malspam and malvertising campaigns have also been discovered propagating an actively-evolving malware called WARMCOOKIE (aka BadSpace), which then acts as a conduit for malware such as CSharp-Streamer-RAT and Cobalt Strike.

"WarmCookie offers a variety of useful functionality for adversaries including payload deployment, file manipulation, command execution, screenshot collection and persistence, making it attractive to use on systems once initial access has been gained to facilitate longer-term, persistent access within compromised network environments," Cisco Talos said.

An analysis of the source code suggests that the malware is likely developed by the same threat actors as Resident, a post-compromise implant deployed in as part of an intrusion set dubbed TA866 (aka Asylum Ambuscade), alongside the Rhadamanthys information stealer. These campaigns have singled out the manufacturing sector, followed closely by government and financial services.

"While long-term targeting associated with the distribution campaigns appears indiscriminate, most of the cases where follow-on payloads have been observed were in the United States, with additional cases spread across Canada, United Kingdom, Germany, Italy, Austria and the Netherlands," Talos said.

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Cybercriminals Use Webflow to Deceive Users into Sharing Sensitive Login Credentials

Can LLM tools actually help defenders in the cybersecurity industry write more effective detection content? Read the full research

Friday, October 25, 2024 10:09

Most users will associate large language models (LLMs) like ChatGPT with answering basic questions or helping to write basics lines of text.  

But could these tools actually help defenders in the cybersecurity industry write more effective detection content?  

Several security researchers from across Cisco recently looked into how LLMs, which have surged in popularity over the past year, could assist them in the detection research process. 

Part of their jobs is to try and perform test behavior that will trigger existing detection rules to check their effectiveness and try to emulate the behavior of a typical adversary — all in the name of updating that detection content to catch the latest tactics, techniques and procedures (TTPs). 

LLMs may be able to assist in this complex, time-consuming tax, as Darin Smith, Yuvi Meiyappan, Moazzam Khan and Ray McCormick write in this paper, which you can download below. 

Khan, a security researcher for Cisco, will be presenting the findings of this paper at the upcoming BSides Portland conference.

How LLMs could help defenders write better and faster detection

PRESS RELEASE

SAN FRANCISCO, Oct. 23, 2024 /PRNewswire/ -- Schubert Jonckheer & Kolbe LLP is investigating a cyberattack and data breach potentially affecting the private information of up to 14 million customers of American Water Works Company, Inc., a New Jersey-based water and wastewater utility company that operates in 14 states and manages 500 water systems.

On October 7, 2024, American Water announced in a Form 8-K filed with the Securities and Exchange Commission that it experienced a cybersecurity incident. The company shut down its MyWater customer portal and is pausing billing until further notice.

American Water has failed to inform its customers whether their private information was stolen by the hackers in the attack, only stating on its website that it will "provide more information when and as appropriate." The company collects and requires its customers to provide personally identifiable information, including names, emails, postal addresses, phone numbers, location information, Internet and other electronic network activity, financial information, health information, and other sensitive personal data.

If your private information was impacted by this incident, you may be at risk of identity theft, financial fraud, and other serious violations of your privacy. As a result, you may be entitled to money damages and an injunction requiring changes to the company's cybersecurity practices.

If you received notification of this data breach or are a current or former customer of American Water and wish to obtain additional information about your legal rights, please contact us today or visit our website at https://www.classactionlawyers.com/americanwater.

About Schubert Jonckheer & Kolbe LLP  
Schubert Jonckheer & Kolbe represents shareholders, employees, and consumers in class actions against corporate defendants, as well as shareholders in derivative actions against their officers and directors. The firm is based in San Francisco, and with the help of co-counsel, litigates cases nationwide.

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American Water Under Investigation for Cyberattack Potentially Affecting 14M Customers

Unauthenticated threat actors can remotely cause a denial-of-service (DoS) cyberattack within the Remote Access VPN software in Cisco's ASA and Firepower software.

Source: Palamarchuk via Shutterstock

Cisco has rushed a patch for a brute-force denial-of-service (DoS) vulnerability in its VPN that's being actively exploited in the wild.

The medium-severity bug (CVE-2024-20481, CVSS 5.8) resides in the Remote Access VPN (RAVPN) found in the Cisco Adaptive Security Appliance (ASA) and Cisco Firepower Threat Defense (FTD) software. If exploited, it could allow an unauthenticated, remote attacker to cause a DoS and disruptions within the RAVPN.

According to Cisco's advisory on the flaw, the vulnerability can be exploited for resource exhaustion by sending a mass number of VPN authentication requests to an affected device, as a cyberattacker would do in an automated brute-force or password-spray attack.

"Depending on the impact of the attack, a reload of the device may be required to restore the RAVPN service," Cisco said in its report. "Services that are not related to VPN are not affected."

Cisco has released software updates to help mitigate the vulnerability, but it notes that there are no other workarounds for the bug. 

It does provide recommendations for evading password-spray attacks, including enabling logging, configuring threat detecting for remote access VPN services, applying hardening measures, and manually blocking connection attempts from unauthorized sources.

**About the Author**

Cisco ASA, FTD Software Under Active VPN Exploitation

Cisco on Wednesday said it has released updates to address an actively exploited security flaw in its Adaptive Security Appliance (ASA) that could lead to a denial-of-service (DoS) condition.
The vulnerability, tracked as CVE-2024-20481 (CVSS score: 5.8), affects the Remote Access VPN (RAVPN) service of Cisco ASA and Cisco Firepower Threat Defense (FTD) Software.
Arising due to resource

Vulnerability / Network Security

Cisco on Wednesday said it has released updates to address an actively exploited security flaw in its Adaptive Security Appliance (ASA) that could lead to a denial-of-service (DoS) condition.

The vulnerability, tracked as **CVE-2024-20481** (CVSS score: 5.8), affects the Remote Access VPN (RAVPN) service of Cisco ASA and Cisco Firepower Threat Defense (FTD) Software.

Arising due to resource exhaustion, the security flaw could be exploited by unauthenticated, remote attackers to cause a DoS of the RAVPN service.

"An attacker could exploit this vulnerability by sending a large number of VPN authentication requests to an affected device," Cisco said in an advisory. "A successful exploit could allow the attacker to exhaust resources, resulting in a DoS of the RAVPN service on the affected device."

Restoration of the RAVPN service may require a reload of the device depending on the impact of the attack, the networking equipment company added.

While there are no direct workarounds to address CVE-2024-20481, Cisco said customers can follow recommendations to counter password spraying attacks -

*   Enable logging
*   Configure threat detection for remote access VPN services
*   Apply hardening measures such as disabling AAA authentication, and
*   Manually block connection attempts from unauthorized sources

It's worth noting that the flaw has put to use in a malicious context by threat actors as part of a large-scale brute-force campaign targeting VPNs, and SSH services.

Earlier this April, Cisco Talos flagged a spike in brute-force attacks against Virtual Private Network (VPN) services, web application authentication interfaces, and SSH services since March 18, 2024.

These attacks singled out a wide range of equipment from different companies, including Cisco, Check Point, Fortinet, SonicWall, MikroTik, Draytek, and Ubiquiti.

"The brute-forcing attempts use generic usernames and valid usernames for specific organizations," Talos noted at the time. "These attacks all appear to be originating from TOR exit nodes and a range of other anonymizing tunnels and proxies."

Cisco has also released patches to remediate three other critical flaws in FTD Software, Secure Firewall Management Center (FMC) Software, and Adaptive Security Appliance (ASA), respectively -

*   **CVE-2024-20412** (CVSS score: 9.3) - A presence of static accounts with hard-coded passwords vulnerability in FTD Software for Cisco Firepower 1000, 2100, 3100, and 4200 Series that could allow an unauthenticated, local attacker to access an affected system using static credentials
*   **CVE-2024-20424** (CVSS score: 9.9) - An insufficient input validation of HTTP requests vulnerability in the web-based management interface of FMC Software that could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system as root
*   **CVE-2024-20329** (CVSS score: 9.9) - An insufficient validation of user input vulnerability in the SSH subsystem of ASA that could allow an authenticated, remote attacker to execute operating system commands as root

With security vulnerabilities in networking devices emerging as a center point of nation-state exploitations, it's essential that users move quickly to apply the latest fixes.

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Cisco Issues Urgent Fix for ASA and FTD Software Vulnerability Under Active Attack

Credential theft was the main goal in 25% of incidents last quarter, and new ransomware variants made their appearance - read more about the top trends, TTPs, and security weaknesses that facilitated adversary actions.

Thursday, October 24, 2024 06:00

Threat actors are increasingly conducting identity-based attacks across a range of operations that are proving highly effective, with credential theft being the main goal in a quarter of incident response engagements.

These attacks were primarily facilitated by living-off-the-land binaries (LoLBins), open-source applications, command line utilities, and common infostealers, highlighting the relative ease at which these operations can be carried out. In addition to outright credential harvesting, we also saw password spraying and brute force attacks, adversary-in-the-middle (AitM) operations, and insider threats, underscoring the variety of ways in which actors are compromising users' identities.  

Identity-based attacks are concerning because they often involve actors launching internal attacks from a compromised, valid account--making such activity difficult to detect. Moreover, once account compromise is achieved, an actor can carry out any number of malicious activities, including account creation, escalating privileges to gain access to more sensitive information, and launching social engineering attacks, like business email compromise (BEC), against other users on the network. 

Watch the team discuss some of the major takeaways of the report, and recommendations for defenders

**Threats against identity **

This quarter, Cisco Talos Incident Response (Talos IR) has responded to a growing number of engagements in which adversaries have leveraged password-spraying campaigns to obtain valid usernames and passwords to facilitate initial access. This quarter, 25 percent of incidents involved password spraying and/or brute force attempts to steal valid credentials. This method involves an adversary using a password, or a small list of commonly used passwords, against many different accounts on a network, a strategy that helps avoid account lockouts that would typically occur when brute-forcing a single account with many passwords. Although adversaries have been using password-spraying attacks for credential access for years, the activity illustrates that organizations should continue to stress the importance of multi-factor authentication (MFA) and strong password policies to limit unauthorized attempts.  

Talos IR observed AitM phishing attacks play out in a number of ways this quarter, where adversaries attempted to trick users into entering their credentials into fake login pages. In one engagement, Talos IR investigated a phishing case where, after clicking a malicious link in a phishing email, the victim was redirected to a site prompting them to enter their credentials, and subsequently approved an MFA request. In another engagement, an initial phishing email redirected a user to a page that simulates a Microsoft O365 login and MFA portal, capturing the user's credentials and subsequently logging in on their behalf. The first login by the adversary was seen 20 minutes after the initial phishing email, highlighting the speed, ease, and effectiveness of these operations. 

**Ransomware **

Ransomware, pre-ransomware, and data theft extortion – in which cybercriminals steal and threaten to release victims’ files or other data without using any encryption mechanisms — accounted for nearly 40 percent of engagements this quarter. Talos IR observed RansomHub, RCRU64, and DragonForce ransomware variants for the first time this quarter, while also responding to previously seen ransomware variants, such as BlackByte, Cerber, and BlackSuit. 

  
A third of these engagements involved exploitation of known vulnerabilities that are consistently leveraged by ransomware operators/affiliates to deploy ransomware, according to public reporting. For example, in one BlackByte ransomware engagement, we observed an admin account created and added to an “ESX Admin” group as part of exploitation of the ESXi hypervisor vulnerability, CVE-2024-37085. This vulnerability, which has reportedly been exploited by other ransomware operators, involves a domain group whose members are granted full administrative access to the ESXi hypervisor by default without proper validation. 

As part of a years-long trend in greater democratization of ransomware adversaries, we continue to see new variants and ransomware operations emerging. In an incident involving the RCRU64 ransomware –a malware family that has received limited public reporting – the adversary used stolen credentials on an accidentally exposed remote desktop protocol (RDP) account to gain initial access. The threat actor then performed a dump of all domain credentials using publicly available tools, such as fgdump and pwdump, to steal Windows hashes. The threat actor also deployed custom tools, including “saxcvz.exe” and “close.exe”, to kill processes and close SQL servers running on the host, respectively. Open-source tools such as Mimikatz, Advanced Port Scanner, and IObit Unlocker were also used to facilitate the compromise. Of note, Talos has not previously seen IObit Unlocker used in a ransomware incident, though the tool has been used in Play ransomware attacks, according to the U.S. Cybersecurity and Infrastructure Security Agency (CISA). 

**Looking forward:** While there are constantly new ransomware groups entering the threat landscape, some established operations still pose a risk and should not be ignored. We saw this most recently last quarter with RansomHub, where Talos IR not only observed RansomHub actors in two separate incidents, but also using two different extortion models: double-extortion and data theft extortion. For example, we observed RansomHub affiliates conduct data theft extortion, where affiliates steal and threaten to release data without deploying ransomware or using any encryption mechanisms, as well as leverage a double-extortion model by deploying ransomware and encrypting systems and exfiltrating data to extort victims, respectively. In late August, this activity coincided with a CISA advisory on the RansomHub ransomware group, which disseminated indicators of compromise (IOCs) and tactics, techniques and procedures (TTPs) identified as recently as August. While RansomHub was first discovered in February 2024, the recent Talos IR incidents and CISA advisory warrants that this continues to be a ransomware threat to monitor. 

****Targeting** **

Organizations in the education, manufacturing, and financial services verticals were most affected this quarter, where combined, these sectors accounted for more than 30 percent of compromises. This finding is in line with targeting trends from Q1 2024 (January - March), where the education and manufacturing companies were the most targeted. 

**  
**Initial access** **

For the fourth consecutive time in over a year, the most observed means of gaining initial access was the use of valid accounts, accounting for 66 percent of engagements when initial access could be determined. This is a _slight_ increase compared to the previous quarter (60 percent). Additionally, 20 percent of engagements featured adversaries exploiting or leveraging vulnerable and public-facing applications for initial access. 

  
**Looking forward:** Talos IR identified a sophisticated actor targeting a critical infrastructure entity leveraging several known vulnerabilities in internet-facing web servers and two F5 BIG-IP network appliances, consistent with Talos’ reporting on state-sponsored and other sophisticated adversaries’ increased interest in targeting network devices. We assess that networking equipment will remain an attractive target due to the large attack surface it presents and potential access to victim networks it can offer, highlighting the dichotomy of high value and weak security in these devices that makes them a prime target for exploitation. This activity is another reminder of the importance of patching systems, especially network-facing devices. 

****Security weaknesses** **

We continue to see a significant number of compromises that could have been prevented with the presence of certain security fundamentals, like MFA and proper configuration of endpoint detection products. In nearly 40 percent of engagements, misconfigured MFA, lack of MFA, and MFA bypass accounted for the top observed security weaknesses this quarter. Additionally, in 100 percent of the engagements that involved threat actors sending phishing emails to victims, MFA was bypassed or not fully enabled, while over 20 percent of incidents where ransomware was deployed did not have MFA enabled on VPNs. 

  
Other security weaknesses, which we commonly see every quarter, involved improper endpoint detection and response (EDR) or security solution misconfigurations. For example, lack of EDR on all systems and/or poorly configured EDR solutions accounted for nearly 30 percent of incidents this quarter. Additionally, nearly 20 percent of engagements this quarter had misconfigured or not fully enabled network security solutions. 

In an incident involving SocGholish, a drive-by malware framework, Talos IR recommended configuring Cisco Umbrella properly to block unwanted content, which could have helped to prevent this attack. Blocking "uncategorized" websites in Cisco Umbrella’s "Web Content Categories" will help proactively mitigate suspicious or malicious activity. 

****Top-observed MITRE ATT&CK techniques** **

The table below represents the MITRE ATT&CK techniques observed in this quarter’s Talos IR engagement. Given that some techniques can fall under multiple tactics, we grouped them under the most relevant tactic in which they were leveraged. Please note, this is not an exhaustive list. 

Key findings from the MITRE ATT&CK appendix include:  

*   In terms of identity-based attacks, we consistently saw adversaries leveraging reconnaissance tactics to identify/gather credentials and then use those valid accounts to gain initial access. This also contributes to the growing trend this quarter in which adversaries are leveraging password spraying to obtain credentials. 
*   Nearly 20 percent of engagements this quarter featured proxy usage for command and control (C2). This activity included tools such as the Fast Reverse Proxy (FRPC) to establish a connection, or the Neo-reGoerg proxy tool to set up a SOCKS proxy. 
*   In a significant shift compared to previous quarters, we saw a decrease in adversary usage of remote access software, such as AnyDesk. Remote access software was used in less than 5 percent of engagements this quarter, compared to 35 percent last quarter (Q2 2024), where these tools provide the attacker an ability to control a target computer remotely. 

Tactic

Technique

Example

Initial Access (TA0001)

T1078 Valid Accounts

Adversary leveraged stolen or compromised credentials

Reconnaissance (TA0043)

T1592 Gather Victim Host Information

Text file contains details about host

Persistence (TA0003)

T1136 Create Account

Created a user to add to the local administrator’s group

Execution (TA0002)

T1059.001 Command and Scripting Interpreter: PowerShell

Executes PowerShell code to retrieve information about the client's Active Directory environment

Discovery (TA0007)

T1046 Network Service Discovery

Use a network or port scanner utility

Credential Access (TA0006)

T1003 OS Credential Dumping

Deploy Mimikatz and publicly available password lookup utilities

Privilege Escalation (TA0004)

T1484 Domain Policy Modification

Modify GPOs to execute malicious files

Lateral Movement (TA0008)

T1021.002 Remote Services: SMB / Windows Admin Shares

Adversaries may abuse valid accounts using SMB to move laterally in a target environment.

Defense Evasion (TA0005)

T1562.001 Impair Defenses: Disable or Modify Tools

Adversaries may disable or uninstall security tools to evade detection

Command and Control (TA0011)

T1105 Ingress Tool Transfer

Adversaries may transfer tools from an external system to a compromised system

Impact (TA0040)

T1486 Data Encrypted for Impact

Deploy Hive ransomware and encrypt critical systems

Exfiltration (TA0010)

T1048.003 Exfiltration Over Alternative Protocol: Exfiltration Over Unencrypted Non-C2 Protocol

Use WinSCP for potential exfiltration of system information

Collection (TA0009)

T1074 Data Staged

Adversary collected data in a central location prior to exfiltration

Software/Tool

S0357 Impacket

An open-source collection of modules written in Python for programmatically constructing and manipulating network protocols

Talos IR trends Q3 2024: Identity-based operations loom large

Cisco Talos reveals TA866’s (also known as Asylum Ambuscade) sophisticated tactics and its link to the new WarmCookie…

Cisco Talos reveals TA866’s (also known as Asylum Ambuscade) sophisticated tactics and its link to the new WarmCookie malware from the BadSpace family. Learn about the threat actor’s persistent attacks, sophisticated tactics, and the advanced tools used to compromise systems.

Cybersecurity researchers at Cisco Talos have revealed new information about the sophisticated operations of TA866, also known as Asylum Ambuscade, a threat actor known for its persistent and adaptable attack strategies. 

TA866 has been active since 2020, focusing on financially motivated malware campaigns and espionage. The group uses numerous tools and techniques, including commodity and custom-built ones as part of its attack.

The group has also adopted a calculated approach, seeking to maintain their presence in compromised environments, carefully assessing the situation, and deploying tools as needed to achieve their objectives.

****The Infection Chain: A Multi-Stage Process****

According to Cisco Talos’ investigation, TA866’s attacks involve a multi-stage infection chain, beginning with the delivery of a malicious JavaScript downloader, which acts as a gateway, retrieving subsequent payloads from attacker-controlled servers. These payloads often take the form of MSI packages, which contain malware such as WasabiSeed.  

WasabiSeed is a crucial downloader component in the infection chain, ensuring persistence by establishing itself on compromised systems using an LNK shortcut. It can continuously poll for additional payloads from attacker-controlled servers, allowing TA866 to deliver subsequent attack stages.

TA866 also uses the Screenshotter malware family to capture periodic screenshots of the infected system. These screenshots provide valuable insights into the victim’s activities and allow TA866 to identify sensitive information or potential targets for further exploitation.  

In addition, TA866 frequently deploys AHK Bot, a modular malware family that uses AutoHotKey scripts to perform various functions such as system enumeration, screenshot capture, domain identification, keystroke logging, credential theft, and more. AHK Bot’s modular nature allows TA866 to customize its capabilities based on the specific needs of each attack.

****WarmCookie and TA866 Connection****

Cisco Talos’ research also highlights connections between WarmCookie malware and TA866, including similar lure themes, overlapping infrastructure, the deployment of CSharp-Streamer-RAT, Cobalt Strike as a follow-on payload, and the use of programmatically generated SSL certificates.

WarmCookie, a notorious malware family also called BadSpace, emerged in April 2024 and has been distributed through malspam and malvertising campaigns. It serves as a backdoor, allowing threat actors long-term access to compromised systems. It offers a wide range of functions like payload deployment, file manipulation, command execution, screenshot collection, and persistence.

> _“We assess that WarmCookie was likely developed by the same threat actor(s) as Resident backdoor, a post-compromise implant previously deployed in intrusion activity that Cisco Talos attributes to TA866.”_
> 
> Cisco Talos Research Team

Researchers also revealed how it is consistently used in invoice-related and job agency themes to lure victims to access hyperlinks in email bodies or attached documents like PDFs. A recent WarmCookie campaign used malspam and invoice lures to distribute malicious PDF attachments. These PDFs redirected victims to JavaScript downloaders on servers linked to the LandUpdates808 infrastructure.

Screenshot: Cisco Talos

TA866’s evolution highlights the complex challenges faced by organizations in defending against cyber threats. Organizations need to stay informed about the latest threat intelligence and implement advanced security measures to mitigate the risks posed by this advanced threat actor.

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TA866 Group Linked to New WarmCookie Malware in Espionage Campaign

Popular titles on both Google Play and Apple's App Store include hardcoded and unencrypted AWS and Azure credentials in their codebases or binaries, making them vulnerable to misuse by threat actors.

Source: Aleksia via Alamy Stock Photo

Several widely used mobile apps, some with millions of downloads, expose hardcoded and unencrypted credentials to cloud services within their code bases, researchers from Symantec have found. This potentially allows anyone with access to the app’s binary or source code to extract the credentials to exploit cloud infrastructure for misuse.

Popular apps for both Android and iPhone devices include credentials for either Amazon Web Services (AWS) and Microsoft Azure Blog Storage within their code, Symantec revealed in a blog post this week. And they're found on each device platform’s respective official mobile app store: Google Play and Apple's App Store.

"This dangerous practice means that anyone with access to the app's binary or source code could potentially extract these credentials and misuse them to manipulate or exfiltrate data, leading to severe security breaches," Symantec engineers wrote in the post.

Further, the "widespread nature" of the vulnerabilities across apps for both iOS and Android platforms "underscores the urgent need for a shift towards more secure development practices" when it comes to mobile applications, they added.

Symantec’s research zeroed in on a number of widely distributed mobile applications that included either AWS or Azure credentials in their codebases. In terms of the former, both Android and iOS apps are guilty of credential exposure, while several Android apps expose Azure storage credentials.

Related:SoftwareOne Launches Cloud Competency Centre in Malaysia

For example, an app called The Pic Stitch: Collage Maker found on the Google Play store contains hardcoded AWS production credentials — including the production Amazon S3 bucket name, the read and write access keys, and secret keys — in its codebase, the researchers found. It also reveals staging credentials in some cases.

**iOS Apps With Serious Security Risks**

Meanwhile, three iOS apps examined by Symantec also were found to expose AWS credentials. One called Crumbl, which has more than 3.9 million user ratings and is ranked No. 5 in the Food & Drink category on the Apple App Store, initializes an AWSStaticCredentialsProvider with plaintext credentials. The credentials, which are used to configure AWS services, include both an access key and secret key.

Furthermore, the app also includes another "significant security oversight" by including a WebSocket Secure (WSS) endpoint within its code. This endpoint, part of the Amazon API URL, is hardcoded with an API Gateway that directly connects to the Internet of Things services on AWS.

"Exposing such URLs alongside static credentials makes it easier for attackers to potentially intercept or manipulate communications, leading to unauthorized access to the associated AWS resources," the engineers wrote. Thus, this vulnerable configuration, without proper encryption or obfuscation, "presents a serious risk to the integrity of the application and its backend infrastructure," they noted.

Related:Unmanaged Cloud Credentials Pose Risk to Half of Orgs

Two other iOS apps with hundreds of thousands of App Store ratings also expose AWS credentials by hardcoding them directly within their code; the apps are Eureka: Earn Money for Surveys and Videoshop – Video Editor.

The former allocates an INMAWSCredentials object and initializes it with the access key and secret key, both stored in plaintext and which can be used to log events to AWS, "exposing critical cloud resources to potential attacks," the engineers said.

The latter directly embeds unencrypted AWS credentials in the \[VSAppDelegate setupS3\] method, which means anyone with access to the app's binary could easily extract them. This would give them unauthorized access to the associated S3 buckets and potentially lead to data theft or manipulation.

**Android Apps Expose Azure Credentials**

Similarly, three Android applications expose credentials to Microsoft Azure Blob Storage directly, via either their binaries or codebases, Symantec found.

Related:Cisco Disables DevHub Access After Security Breach

An Indian ride-sharing app, Meru Cabs — which has more than 5 million downloads on Google Play — includes hardcoded Azure credentials within its UploadLogs service by embedding a connection string that includes an account key. "This connection string is used to manage log uploads, exposing critical cloud storage resources to potential abuse," the engineers wrote.

Sulekha Business, another Android app with more than 500,000 downloads, embeds multiple hardcoded Azure credentials used for various purposes — such as adding posts, handling invoices, and storing user profiles — across its codebase.

A third Android app that also has more than 500,000 downloads, ReSound Tinnitus Relief, also hardcodes Azure Blob Storage credentials for managing various assets and sound files, the exposure of which could lead to unauthorized access and data breaches.

**Mitigation Begins With App Development**

Symantec’s findings come a day after the release of a report by Datadog that found that unmanaged credentials that live for too long on a cloud-based network posed a security risk to half of organizations. Indeed, any inadvertent disclosure of credentials to cloud services exposes any organization with network infrastructure, software, or other assets running on them to significant risk, according to Symantec.

A good place to start to mitigate these risks is in the development of applications, where developers should follow best practices for managing sensitive information. They include the use of environment variables to store sensitive credentials so they are loaded at runtime rather than embedded directly in the app's code, according to Symantec.

Developers also should use dedicated secrets management tools, such as AWS Secrets Manager or Azure Key Vault, to securely store and access credentials. If the credentials must be stored in the app, then they should ensure that they use strong encryption algorithms, and decrypt them at runtime as needed.

According to Symantec, another way to protect credentials and also avoid other potential app-development missteps is to integrate automated security-scanning tools into the development pipeline to detect common security flaws early in the development process.

**About the Author**

Elizabeth Montalbano is a freelance writer, journalist, and therapeutic writing mentor with more than 25 years of professional experience. Her areas of expertise include technology, business, and culture. Elizabeth previously lived and worked as a full-time journalist in Phoenix, San Francisco, and New York City; she currently resides in a village on the southwest coast of Portugal. In her free time, she enjoys surfing, hiking with her dogs, traveling, playing music, yoga, and cooking.

Mobile Apps With Millions of Downloads Expose Cloud Credentials

WarmCookie is a malware family that emerged in April 2024 and has been distributed via regularly conducted malspam and malvertising campaigns.

Wednesday, October 23, 2024 06:02

*   WarmCookie is a malware family that emerged in April 2024 and has been distributed via regularly conducted malspam and malvertising campaigns. 
*   WarmCookie, observed being used for initial access and persistence, offers a means for continuous long-term access to compromised environments and is used to facilitate delivery of additional malware such as CSharp-Streamer-RAT and Cobalt Strike. 
*   Post-compromise intrusion activity associated with WarmCookie overlaps with previously observed activity we attribute to TA866.  
*   We assess that WarmCookie was likely developed by the same threat actor(s) as Resident backdoor, a post-compromise implant previously deployed in intrusion activity that Cisco Talos attributes to TA866.  

**What is WarmCookie? **

WarmCookie, also known as BadSpace, is a malware family that has been distributed since at least April 2024. Throughout 2024, we have observed several distribution campaigns conducted using a variety of lure themes to entice victims to take actions that result in malware infection.  

These campaigns typically rely on malspam or malvertising to initiate the infection process that results in the delivery of WarmCookie. WarmCookie offers a variety of useful functionality for adversaries including payload deployment, file manipulation, command execution, screenshot collection and persistence, making it attractive to use on systems once initial access has been gained to facilitate longer-term, persistent access within compromised network environments.  

In previously analyzed intrusion activity involving WarmCookie, we have observed that it is used as an initial payload and that CSharp-Streamer-RAT and Cobalt Strike were delivered following the initial WarmCookie infection.  

While analyzing the campaigns, intrusion activity, and infrastructure associated with WarmCookie over the course of 2024, we also identified multiple overlaps with activity conducted by TA866 in 2023. 

**Typical infection chains **

As previously mentioned, we have observed WarmCookie campaigns being conducted since at least April 2024. These campaigns rely on malspam or malvertising to facilitate the delivery of malicious content.  

In the case of malspam, we have observed consistent use of invoice-related and job agency themes that entice victims to access hyperlinks present in either the email body, or within attached documents, such as PDFs.  

Examples of common message subjects observed in campaigns conducted between April and August 2024 are listed below. 

*   United Rentals Inc: Invoice# [0-9]{9}\-[0-9]{3} 
*   Invoice and Remittance

In a recent campaign conducted in August, the messages contained PDF attachments. The attachment filenames were randomized but typically use the following format. 

*   Attachment_[0-9]{3}\-[0-9]{3}\.pdf

While there have been variations over time, below is a representative example of one of these emails and the associated PDF attachment. 

__WarmCookie emails and attachments.__

The PDFs contain hyperlinks that direct victims to web servers hosting malicious JavaScript files that continue the infection process. 

We have also observed WarmCookie campaigns leveraging infrastructure associated with traffic distribution and malware delivery systems. In one early campaign, we observed the use of the LandUpdates808 cluster of infrastructure described here. In observed cases, malicious JavaScript downloaders were being hosted at the following paths on servers associated with the LandUpdates808 cluster of web servers. 

/wp-content/upgrade/update\[.\]php

Regardless of whether the delivery stage of the attack was conducted via malspam or malvertising, an obfuscated JavaScript downloader is delivered that is responsible for continuing the infection process. We have observed the use of ZIP archives to compress the JavaScript file and the delivery of the JavaScript file directly from the distribution infrastructure.  

When executed, it deobfuscates and executes a PowerShell command that uses Bitsadmin to retrieve and execute the WarmCookie DLL using syntax, like that shown below. 

__PowerShell execution.__

We have observed a relatively small number of distribution servers hosting WarmCookie DLLs compared to the infrastructure used in earlier stages of the infection chain.  

**WarmCookie **

The main WarmCookie payload has been extensively analyzed in prior reporting here and here. While performing this research, newly observed WarmCookie samples were reported on social media during September 2024. We observed significant additions and changes in this latest version that demonstrate the threat actor is continuing to improve their tooling.  

We observed changes to the way the malware is executed and how persistence is achieved on infected systems. As described in prior reporting, the malware is typically delivered and executed as a PE DLL or a PE EXE. If the payload is in the DLL format, it is typically executed with specific command-line parameters that determine whether persistence should be achieved.  

In previous WarmCookie samples the execution was consistent with the following: 

rundll32.exe <DLL\_Filename>,Start /p

In the latest samples analyzed, this command-line syntax has been modified as follows: 

rundll32.exe <DLL\_Filename>,Start /u

Additionally, the user agent used during C2 communications in previous WarmCookie samples featured extraneous spaces not consistent with normal user agent strings seen in the wild. This allowed for easy detection of WarmCookie C2 activity via network traffic inspection. In the latest WarmCookie samples, this mistake has been corrected. Below is a comparison between the old and new user agent strings used during C2 communications. 

Old User Agent: 

Mozilla / 4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1;.NET CLR 1.0.3705)

New User Agent: 

Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0

We also observed the inclusion of a new self-updating mechanism that would enable an attacker to dynamically deliver updates to WarmCookie via the C2 server, however, this functionality did not appear to be fully implemented in the analyzed sample at the time. 

In the latest sample, changes were made to the sandbox detection mechanism present in the malware where some checks present in previous versions have been removed. 

__WarmCookie sandbox detection.__

Several changes to the C2 commands supported by the malware have also been made in the latest WarmCookie samples analyzed. The command to remove persistence and the malware itself has been deleted. New commands have been added as follows: 

*   **Command 0x8:** Supports the creation of a DLL file received from the C2 server that is assigned a temporary filename and then executed by WarmCookie.   
*   **Command 0xA**: Appears to be a prepared update command, it is like Command 0x8, but adds hardcoded parameters to the DLL:    
    C:\Windows\System32\rundll32.exe <tmpfilename.dll> Start /update
*   **Command 0xB**: Supports moving the malware to a temporary file name and location and deletes the previously scheduled task. It prepends the string ‘dat’ to the temporary filename. It also exits the C2 loop, leading to termination of the malware process. 

During the malware’s initialization and startup phase, the /update parameter of the Command 0xA is checked to determine if the parameter was set. Regardless of the result of this check, the same function is executed, as shown below. 

WarmCookie update parameter. 

Analysis suggests that the malware will continue to evolve moving forward as the threat actor continues to improve on it and adds additional functionality as needed. 

**Links to past intrusion activity **

While analyzing the distribution campaigns, infrastructure used, and post-compromise intrusion activity associated with WarmCookie, we identified multiple overlaps with previously observed malicious activity.  

In earlier WarmCookie distribution campaigns, threat actors relied on lures that appear as if they were associated with talent/job search agencies. As mentioned here, the lure documents and landing pages associated with this campaign are like those used by distributors of Ursnif in past campaigns.  

While analyzing intrusion activity associated with WarmCookie, we observed the deployment of CSharp-Streamer-RAT as a follow-on payload following the initial system compromise. CSharp-Streamer-RAT is a full-featured remote access trojan that offers robust functionality as described here.  

In this case, the sample reached out to a C2 server that was configured to use an SSL certificate that appeared to have been programmatically generated with several fields randomly populated. Using Regular Expressions to identify other servers with similar SSL characteristics, we identified three additional C2 servers, all previously associated with CSharp-Streamer-RAT samples. One of these C2 servers was observed being used by a CSharp-Streamer-RAT sample we identified in a previous intrusion that we assess with high confidence was conducted by TA866.  

The screenshot below shows the relevant fields present within the SSL certificate associated with the CSharp-Streamer-RAT C2 server observed in previous intrusion activity we attribute to TA866.  

__Previous CSharp-Streamer-RAT C2 SSL certificate.__

Below is an example of one of the SSL certificates associated with the CSharp-Streamer-RAT C2 server observed in recent WarmCookie intrusion activity. 

__Recent CSharp-Streamer-RAT C2 SSL certificate.__

Based on analysis of the system involved in this prior intrusion activity, we assess with high confidence that TA866/Asylum Ambuscade deployed CSharp-Streamer-RAT while directly operating on the system leading up to, during, and after its deployment. In the recent WarmCookie case, we also assess with high confidence that the attacker who deployed WarmCookie also deployed CSharp-Streamer-RAT following the initial compromise.

**WarmCookie vs. Resident backdoor **

As referenced here, and in prior reporting, TA866/Asylum Ambuscade has been observed delivering a post-compromise implant called Resident backdoor in prior intrusion activity. Prior reporting on WarmCookie has alluded to observed links between Resident backdoor and WarmCookie.

We performed a code and function level analysis of Resident backdoor samples from previous intrusion activity and WarmCookie samples from September 2024 and observed several notable similarities in the way core functionality has been implemented across both malware families. WarmCookie appears to contain much of the same functionality as Resident backdoor but has been significantly extended to support additional functionality.  

We assess that both were likely developed by the same entity based on the following analysis findings: 

*   The RC4 implementation is consistent across both malware families. 
*   The RC4 string decryption function implementation is consistent across both malware families. 
*   Mutex management is performed consistently across both malware families. 
*   Both malware families use GUID-like strings for the mutex. 
*   The way in which various functions were constructed and the coding conventions used is consistent. 
*   The definition of scheduled tasks to achieve persistence is consistent. 
*   Both malware families wait one minute before executing the scheduled task. 
*   The directory, file schema and parameters are similar in both malware families.  
*   The initial startup logic and command line parameter implementation are similar. 

**Code similarity analysis **

We conducted a similarity analysis of the code execution flow between both Resident backdoor and a recent WarmCookie sample that was shared on social media. We observed consistent implementation of core functionality across both as well as consistent use of coding conventions across both malware families. 

**Task Scheduler implementation **

If the malware is initially executed without supplying any parameters, both Resident and WarmCookie first determine if the initially launched application was a PE DLL or an PE EXE. Depending on the result, they either create a filename with the extension “.dll" or “.exe". Also based on the results of this test, they both create a scheduled task via the Windows Task Scheduler, which spawns a copy of the malware after waiting for 60 seconds. In the case that the initially launched application was a PE DLL, rundll32.exe is used to launch the malware. In the case of a PE EXE file, it is executed directly.  

They both attempt this in the %ALLUSERSPROFILE% directory, if that fails, they try it again in %ALLDATA% directory. 

__WarmCookie startup parameters.__

__WarmCookie persistence mechanism.__

__Resident backdoor startup parameters.__

__Resident backdoor persistence mechanism.__

__Resident backdoor persistence mechanism (cont’d).__

The overall startup logic is also the same in both Resident backdoor and WarmCookie. At the beginning of the startup process both check to determine if the malware was executed with a command line switch. In the case of the Resident backdoor, it is ‘/p’; in the case of WarmCookie it is ‘/u’. This parameter tells the application whether it is the first instance of itself or if the running version is the former copied version, which was previously made persistent via the Task Scheduler. This prevents multiple scheduled tasks from being created once the malware has achieved persistence.  

__WarmCooke startup logic.__

__Resident backdoor startup logic.__

One slight difference is that Resident uses the hardcoded string ‘RtlUpd’ to generate the filename for the scheduled task, whereas WarmCookie uses a hardcoded list of company names and randomly selects one, as shown below: 

__WarmCookie filename list.__

Based on our analysis of Resident backdoor and WarmCookie, we assess that they were likely developed by the same entity. While there are significant overlaps in the code and functionality implementations across Resident backdoor and WarmCookie, WarmCookie contains significantly more robust functionality and command support compared to Resident backdoor. Additionally, while WarmCookie has typically been deployed as an initial access payload in intrusion activity we have analyzed, Resident backdoor was deployed post-compromise following the deployment of several other components such as WasabiSeed, Screenshotter and AHK Bot.  

Given the differences in functionality and where each is encountered in the attack lifecycle, we classify Resident and WarmCookie as separate malware families that have been developed by the same threat actor. 

**Coverage **

Ways our customers can detect and block this threat are listed below. 

 Cisco Secure Endpoint (formerly AMP for Endpoints) is ideally suited to prevent the execution of the malware detailed in this post. Try Secure Endpoint for free here. 

Cisco Secure Web Appliance web scanning prevents access to malicious websites and detects malware used in these attacks. 

Cisco Secure Email (formerly Cisco Email Security) can block malicious emails sent by threat actors as part of their campaign. You can try Secure Email for free here. 

Cisco Secure Firewall (formerly Next-Generation Firewall and Firepower NGFW) appliances such as Threat Defense Virtual, Adaptive Security Appliance and Meraki MX can detect malicious activity associated with this threat. 

Cisco Secure Malware Analytics (Threat Grid) identifies malicious binaries and builds protection into all Cisco Secure products. 

Umbrella, Cisco's secure internet gateway (SIG), blocks users from connecting to malicious domains, IPs and URLs, whether users are on or off the corporate network. Sign up for a free trial of Umbrella here. 

Cisco Secure Web Appliance (formerly Web Security Appliance) automatically blocks potentially dangerous sites and tests suspicious sites before users access them. 

Additional protection with context to your specific environment and threat data are available from the Firewall Management Center. 

Cisco Duo provides multi-factor authentication for users to ensure only those authorized are accessing your network. 

Open-source Snort Subscriber Rule Set customers can stay up to date by downloading the latest rule pack available for purchase on Snort.org. 

The following Snort rule(s) have been developed to detect activity associated with this malicious activity.  

*   Snort 2 SIDs: 64139, 64140, 64141, 64142, 64143, 64144, 64145, 64146, 64147, 64148, 64149, 64150, 64151, 64152, 64153, 64154, 64155, 64156, 64157, 64158, 64159, 64160, 64161, 64162. 
*   Snort 3 SIDs: 64153, 64154, 64155, 64156, 64157, 64158, 64159, 64160, 64161, 64162, 301044, 301045, 301046, 301047, 301048, 301049, 301050.  

The following ClamAV signatures have been developed to detect activity associated with this malicious activity.  

*   Js.Downloader.Agent-10022279-0  
*   Vbs.Downloader.Agent-10022291-0  
*   Win.Trojan.WasabiSeed-10022304-0  
*   Js.Trojan.Screenshotter-10022306-0  
*   Js.Trojan.Agent-10022307-0  
*   Win.Trojan.Lazy-10022308-0  
*   Win.Trojan.Screenshotter-10022309-0  
*   PUA.Win.Tool.NetPing-10022493-0  
*   Win.Malware.CobaltStrike-10022494-0  
*   PUA.Win.Tool.AutoHotKey-10022305-1  
*   PUA.Win.Tool.RemoteUtilities-9869515-0  
*   PUA.Win.Tool.AdFind-9962378-0   
*   Txt.Downloader.AHKBot-10024463-0  
*   Ps1.Malware.CobaltStrike-10024466-0  
*   Win.Infostealer.Rhadamanthys-10024467-0  
*   Txt.Infostealer.Rhadamanthys-10024468-0  
*   Win.Backdoor.Agent-10025011-0  
*   Vbs.Trojan.Screenshotter-10025015-0  
*   Win.Malware.Warmcookie-10036688-0 
*   Win.Malware.CSsharpStreamer-10036641-0 

**Indicators of Compromise **

Indicators of compromise associated with WarmCookie/BadSpace activity can be found in our GitHub repository here.

Tag

#cisco