#windows

A threat actor is using a sophisticated EDR-killing malware tool in a campaign to maintain long-term, persistent access on Windows systems.

MostereRAT malware targets Windows through phishing, bypasses security with advanced tactics, and grants hackers full remote control. Cybersecurity…

North Korea’s Lazarus Group uses the ClickFix scam in fake crypto job interviews to deploy malware, steal data,…

Cybersecurity never slows down. Every week brings new threats, new vulnerabilities, and new lessons for defenders. For security and IT teams, the challenge is not just keeping up with the news—it’s knowing which risks matter most right now. That’s what this digest is here for: a clear, simple briefing to help you focus where it counts. This week, one story stands out above the rest: the

A list of topics we covered in the week of September 1 to September 7 of 2025

A threat actor possibly of Russian origin has been attributed to a new set of attacks targeting the energy sector in Kazakhstan. The activity, codenamed Operation BarrelFire, is tied to a new threat group tracked by Seqrite Labs as Noisy Bear. The threat actor has been active since at least April 2025. "The campaign is targeted towards employees of KazMunaiGas or KMG where the threat entity

### Impact **What kind of vulnerability is it?** This is a **Critical** severity directory traversal (path traversal) vulnerability in the `File.download()` method of the `internetarchive` library. **Who is impacted?** All users of the `internetarchive` library versions `< 5.5.1` are impacted. The vulnerability is particularly critical for users on **Windows systems**, but all operating systems are affected. **Description of the vulnerability:** The vulnerability existed because the `file.download()` method did not properly sanitize user-supplied filenames or validate the final download path. A maliciously crafted filename could contain path traversal sequences (e.g., `../../../../windows/system32/file.txt`) or illegal characters that, when processed, would cause the file to be written outside of the intended target directory. **Potential Impact:** An attacker could potentially overwrite critical system files or application configuration files, leading to a denial of service, privil...

The threat actor behind the malware-as-a-service (MaaS) framework and loader called CastleLoader has also developed a remote access trojan known as CastleRAT. "Available in both Python and C variants, CastleRAT's core functionality consists of collecting system information, downloading and executing additional payloads, and executing commands via CMD and PowerShell," Recorded Future Insikt Group

A misconfiguration in the sudoers file permits passwordless execution of specific Bash shell scripts via sudo, exposing a critical privilege escalation vulnerability. When such scripts are writable by a web-facing user (www-data) or accessible through a command injection vector, an attacker can overwrite or replace them with malicious payloads. Upon execution with sudo, these scripts run with elevated privileges, allowing the attacker to gain full root access remotely.

APT28 hackers deploy NotDoor backdoor via Microsoft Outlook macros, using OneDrive sideloading to steal data and evade detection.