Zyxel users beware: A critical remote code execution flaw (CVE-2023-28771) in Zyxel devices is under active exploitation by a Mirai-like botnet. GreyNoise observed a surge on June 16, targeting devices globally.

A serious security vulnerability, tracked as CVE-2023-28771, is affecting Zyxel networking devices. Security researchers at GreyNoise noticed a sudden sharp rise, and a concentrated effort by attackers to exploit this flaw on June 16th.

The vulnerability allows for remote code execution, which means attackers can run their own programs on vulnerable devices from a distance. This particular weakness is found in how Zyxel devices handle specific internet messages, called Internet Key Exchange (IKE) packets coming through the UDP port 500.

****The Sudden Surge and Its Reach****

While attacks targeting this Zyxel flaw had been minimal, June 16th brought a significant spike in activity. GreyNoise recorded 244 different internet addresses trying to exploit the issue within a single day.

Source: GreyNoise

These attacks are aimed at devices in various countries, with the following being the most targeted:

*   India
*   Spain
*   Germany
*   United States
*   United Kingdom

Interestingly, a review of these 244 attacking addresses showed they had not been involved in any other suspicious network activity in the two weeks leading up to this sudden burst.

****Tracing the Source****

An investigation into the attacking internet addresses revealed they were all registered under Verizon Business infrastructure and appeared to originate from the United States. However, because the attacks use UDP port 500, which allows for spoofing (faking the sender’s address), the true source might be hidden, noted GreyNoise researchers in their blog post shared with Hackread.com.

Further analysis by GreyNoise, supported by checks from VirusTotal, found signs that these attacks might be linked to variants of the Mirai botnet, a type of malicious software that takes over devices.

In response to these active threats, security experts are urging immediate action. It is advised to block all 244 identified malicious IP addresses and to check if any internet-connected Zyxel devices have the necessary security patches for CVE-2023-28771.

Device owners should also watch for any unusual activity after an exploit attempt, as this could lead to further compromise or the device being added to a botnet. Finally, it’s recommended to limit any unnecessary exposure of IKE/UDP port 500 by applying network filters.

It’s important to note that Zyxel devices have faced security challenges in the past. For instance, Hackread.com reported in June 2024, about Zyxel NAS devices being targeted by a Mirai-like botnet exploiting a different recent vulnerability (CVE-2024-29973), highlighting a recurring pattern of issues for the company’s products.

“This was added to the CISA Known Exploited vulnerabilities list on May 31, 2023, requiring agencies to have it resolved before June 21 that same year. The activity observed appears to be the Mirai botnet activity,” said Martin Jartelius, CISO at cybersecurity company Outpost24.

“As the vulnerability has been extensively targeted before, for someone to fall victim now, they would have had to obtain a vulnerable device, deploy it without updates, and expose it to the internet, even though it’s in a known vulnerable state,” explained Martin.

“One would almost say that the chain of incompetence needed to be victimized at this point is borderline impressive, but of course, it can happen. This, however, is not the vulnerability we should all wake up and worry about today. In fact, if you were worried about it, you would have fixed it years ago.”

Zyxel Devices Hit by Active Exploits Targeting CVE-2023-28771 Vulnerability

A vulnerability in the popular Python-based tool for building AI agents and workflows is under active exploitation, allowing for full system compromise, DDoS attacks, and potential loss or theft of sensitive data

Hackers Exploit Critical Langflow Flaw to Unleash Flodrix Botnet

Cybersecurity researchers have called attention to a new campaign that's actively exploiting a recently disclosed critical security flaw in Langflow to deliver the Flodrix botnet malware.
"Attackers use the vulnerability to execute downloader scripts on compromised Langflow servers, which in turn fetch and install the Flodrix malware," Trend Micro researchers Aliakbar Zahravi, Ahmed Mohamed

New Flodrix Botnet Variant Exploits Langflow AI Server RCE Bug to Launch DDoS Attacks

The two campaigns are good examples of the ever-shrinking time-to-exploit timelines that botnet operators have adopted for newly published CVEs.

Mirai Botnets Exploit Flaw in Wazuh Security Platform

Akamai's latest report reveals two Mirai botnets exploiting the critical CVE-2025-24016 flaw in Wazuh. Learn about these fast-spreading IoT threats and urgent patching advice.

Cybersecurity experts at Akamai have uncovered a new threat: two separate botnets are actively exploiting a critical flaw in Wazuh security software, open source XDR and SIEM solution, to spread the Mirai malware.

This vulnerability, tracked as CVE-2025-24016, affects Wazuh versions 4.4.0 through 4.9.0 and has since been fixed in version 4.9.1. It lets attackers run their own code on a target server by sending a specially crafted request through Wazuh’s API, hence, allowing attackers to take control of affected servers remotely.

It is worth noting that this is the first time active attacks using this vulnerability have been reported, highlighting a concerning trend where cybercriminals quickly turn newly discovered flaws into tools for their campaigns.

****Two Botnets, One Goal****

The technical report, shared with Hackread.com, reveals that Akamai’s Security Intelligence and Response Team (SIRT) first noticed suspicious activity in their global network of honeypots in March 2025, just weeks after the flaw was made public in February 2025.

The team identified two distinct botnets leveraging this exploit. The first botnet began its attacks in early March, using the vulnerability to download and run a malicious script. This script then pulls down the main Mirai malware, which is designed to infect a wide range of Internet of Things (IoT) devices.

These Mirai variants, sometimes named morte, are identifiable by a unique message they display, such as lzrd here_._ These initial attacks used the same authorization details as a publicly available proof of concept (PoC) exploit, meaning attackers quickly adapted known information.

The second botnet emerged in early May 2025, also spreading a Mirai variant called resgod. This botnet caught attention because its associated online addresses (domains) featured Italian-sounding names, like gestisciweb.com, which means manage web. This could suggest the attackers are specifically trying to target devices owned by Italian-speaking users. The resgod malware itself carries the clear message, “Resentual got you!”

****Beyond Wazuh: Other Exploited Flaws****

While the Wazuh vulnerability is the primary focus, the botnets weren’t limited to it. Akamai observed these malicious groups attempting to exploit several other well-known security flaws. These included older vulnerabilities in systems like Hadoop YARN, TP-Link Archer AX21 routers (CVE-2023-1389), Huawei HG532 routers (CVE-2017-17215), and ZTE ZXV10 H108L routers (CVE-2017-18368). This shows that the attackers use a broad approach, trying to infect systems through any available weakness.

Akamai’s report warns that it remains relatively easy for criminals to reuse old malware code to create new botnets. The speed at which this Wazuh flaw was exploited after its disclosure underlines how critical it is for organizations to apply security patches as soon as they become available.

Unlike some vulnerabilities that only affect outdated devices, CVE-2025-24016 specifically targets active Wazuh servers if they are not updated. Akamai strongly advises all users to upgrade to Wazuh version 4.9.1 or later to protect their systems.

Two Mirai Botnets, Lzrd and Resgod Spotted Exploiting Wazuh Flaw

A now-patched critical security flaw in the Wazur Server is being exploited by threat actors to drop two different Mirai botnet variants and use them to conduct distributed denial-of-service (DDoS) attacks.
Akamai, which first discovered the exploitation efforts in late March 2025, said the malicious campaign targets CVE-2025-24016 (CVSS score: 9.9), an unsafe deserialization vulnerability that

Two Distinct Botnets Exploit Wazuh Server Vulnerability to Launch Mirai-Based Attacks

Though the operation was partially disrupted earlier this year, the botnet remains active and continues to target connected Android devices.

BADBOX 2.0 Targets Home Networks in Botnet Campaign, FBI Warns

On Christmas Day in 2014 hackers knocked out the Xbox and PlayStation gaming networks, impacting how video game companies handled cybersecurity for years.

The Andersons are Christmas traditionalists. Dan says it’s more his wife Paige than him, but secretly he also loves all the fuss.

So, there they were on the sofa in their pajamas in front of the twinkling Christmas tree before the sun had risen over a chilly morning in Buffalo, New York. Thirty-two-year-old Dan was proud and smug as he handed over his gift to Paige—a “fancy new Kindle Voyage.” She loved it. Then it was his turn, and he excitedly ripped into the wrapping paper watched over by his confused dogs—one of which was tellingly named after Dan’s favorite computer-game character (Vivi from _Final Fantasy_). As the present revealed itself, the avid gamer saw the instantly recognizable and much-loved logo—it was a brand-new PlayStation 4. Straight away he unpacked it, rigged it up to the TV, and switched it on. The plan was to get it fired up and download _LittleBigPlanet 3_ to play for a few hours before meeting up with family.

Paige had been looking forward to it since she bought the new console. However, it wasn’t to be. “We didn’t even make it as far as starting to download the game, because it wouldn’t let me log in to PlayStation Network,” Dan said. “Nothing was online at all, so we couldn’t even try and download games.” Disappointedly they headed out for the day’s events and couldn’t try again until that evening, when they discovered that the network was still down. A $400 gift they couldn’t play. Dan had to work the next day too, so he couldn’t even try it then. He was gutted.

Five hundred and fifty miles north, in Toronto, 16-year-old Mustafa Aijaz was pumped. Christmas Day—particularly the evening—was the best game time of the year. It’s always been a bit of a holiday within the holiday for serious players. The tradition revolves around a phenomenon called “Christmas Noobs.” At Christmas, so many new players receive new games and consoles that online games are flooded with a tidal wave of gamers who often fumble their way through the top games and act like cannon fodder for the waiting legions of seasoned veterans. Mustafa and his mates were skilled at _Call of Duty: Advanced Warfare_. “We were all ready for a night of easy wins, quick XP \[experience points\] farming, and were looking forward to leveling up like crazy.” So, they waited like crocodiles anticipating herds of migrating buffalo to enter the river. But just as the bullets started flying they were all unceremoniously chucked out of their matches and knocked offline. “None of us could log back in, and party chat was down too, so we couldn’t even talk to each other to figure out what was happening,” Mustafa said.

It was all over social media: A group of hackers called Lizard Squad were bragging about their massive DDoS attack on Xbox Live and PlayStation Network—the crucial services that linked tens of millions of gamers to the Microsoft and Sony servers. Mustafa had seen that the group had already carried out smaller-scale attacks and had for weeks been taunting and threatening a big attack. Apparently it was all linked to some silly and incomprehensible spat with a rival but minor hacking group. Mustafa was angry but also fascinated by the attack and the incredible reaction online. “The fallout was instantaneous. People were furious,” he said.

PlayStation Network at the time had about 110 million subscribers, and Xbox Live had roughly 48 million. Xbox was back to normal within 24 hours—on Boxing Day. But PlayStation struggled for longer. It didn’t just affect existing subscribers. Before you can use any new games, consoles, or vouchers, you need to register them via the gaming company’s servers. It was a catastrophe for the games industry, especially Sony, which had already been having a tough time after a different cyberattack the previous month.

Services were down around the world. Error messages in dozens of languages were being posted as screenshots on YouTube and Twitter. There was nothing anyone could do until the engineers at Sony and Microsoft figured it out or Lizard Squad stopped the attack.

Late in the evening on Boxing Day, BBC Radio 5 Live aired an interview with two members of the group. They showed zero remorse for the impact they’d had on people around the world. Twelve hours later I walked into the newsroom and was given the seemingly impossible task of “getting a Lizard” on the evening TV bulletin at Sky News.

It took hours of trawling Twitter and speaking to dozens of wannabes and fakes, but I eventually succeeded in finding contact details for a British man called Vinnie Omari. Incredibly, he lived a few miles from our newsroom in west London. He agreed to come to us for the interview and was pale, skinny, wore all black and talked fast. He was at pains to distance himself from the gang but left the studios promising that a Lizard Squad hacker called “Ryan” would be in touch. I had no idea at the time of course that this “Ryan” was Julius Kivimäki—an already infamous teenage hacker and delinquent from Finland. It was later that afternoon—at around 3 pm —that “Ryan” called through on Skype. Just in time for us to edit our conversation with him into our news piece.

The 17-year-old looked very young and pale and had a shaved head and soft features. In spite of everything, he was polite and seemed in no rush. But he was also utterly unremorseful and arrogant, struggling to stifle a smirk throughout the interview. When I started by asking him why he wanted to ruin Christmas for tens of millions of people, he gave me the same boilerplate answer about the boys doing it to amuse themselves and embarrass these tech mega corps. “These companies make tens of millions every month from just their subscriber fees, and they should have more than enough funding to be able to protect against these attacks.” We went back and forth for about 15 minutes without him giving any hint of regret or awareness for how many people had been affected by his stunt.

“I’d be worried if those people didn’t have anything better to do than play games on their consoles at Christmas Eve and Christmas Day,” he said. “I mean, I can’t really say I feel bad. I might have forced a couple of kids to spend their time with their families instead of playing games.”

The interview blew up online, with more than a million views on YouTube and thousands of comments on Twitter, where many four-letter words were hurled at the Lizards. PlayStation and Xbox also received a torrent of abuse. Later they would offer a five-day extension to players’ subscription periods and 10 percent off as compensation. The resulting bill for the company must easily have been in the millions.

Kivimäki went on to speak to other reporters, sometimes calling himself Ryan Cleary (a reference to another hacker he had vague and likely acrimonious link to from a previous teen hacker gang called LulzSec). In one interview and debate on YouTube channel DramaAlert he is implored by Kim Dotcom to stop the silly hacker rivalries that were impacting so many innocent people. “Hackers used to be respected; they used to have a magic about them,” Kim said, accusing Lizard Squad of harming the image of hackers around the world with their actions. Kivimäki’s response is fascinating: He laughed it off as old-fashioned thinking. “It’s wrong to connect groups like Lizard Squad with, for example, L0pht from a couple of decades back,” he said. “There’s really no connection with the hacking groups of today and the hacking groups of two decades ago. The meaning is totally different now.”

Although many security experts angrily railed against the media’s portrayal of Lizard Squad as “sophisticated,” people grudgingly came to accept that the Christmas attack did have a big impact on cybersecurity and the gaming industry. There’s little doubt that this was not the group’s motive—despite their clumsy attempts to claim so in interviews. But it was a wake-up call. Security website SecurityAffairs wrote a “lessons learned” piece by dissecting my interview with Kivimäki. Many people considered Lizard Squad script kiddies, they wrote, adding, “This approach is totally wrong.”

The size of the attack unleashed on that day would be shrugged off by most modern sites, but DDoS attacks are still commonplace and are getting more powerful. Expensive protection services are now a must-have for any organization that needs to stay online.

The attacks also started something of a cybercrime trend. In 2024 Europol unveiled an international law enforcement operation to take DDoS services down in December: “The festive season has long been a peak period for hackers to carry out some of their most disruptive DDoS attacks, causing severe financial loss, reputational damage, and operational chaos for their victims,” the organization said in a statement.

At the time of Lizard Squad’s attacks, the general public was stunned. Despite Lizard Squad being on the tail end of a wave of teenage hacking groups in the 2010s, there was little awareness of the power that could be wielded by these otherwise amateur attackers. There might have been a vague feeling in the zeitgeist that “hackers in hoodies in their bedrooms” were increasingly causing problems, but this attack was immediate, unmissable, and easy to understand. It was of course also easy to get angry about. Over the next couple of days I came back to the story with follow-ups about the fallout as other Lizard Squad members spoke to YouTubers about the so-called “drama.” But the big thing the newsroom kept asking me was, When would these kids be arrested?

Vinnie Omari was the first. On New Year’s Eve he was raided by the South East Regional Organized Crime Unit, which collared him on suspicion of cyber fraud offenses committed in 2013 and 2014. It looked like the raid was for other alleged offenses involving PayPal fraud, but the search warrant, which later surfaced online, also referenced the Christmas DDoS attacks. “They took everything: Xbox One, phones, laptops, computer USBs, etc.,” Omari told reporter William Turton from the Daily Dot. He was later cleared of any involvement.

After Omari’s arrest, other Lizards were taken out too. On January 16, 2015, police announced that they had arrested an 18-year-old in Southport, near Liverpool. They didn’t give a name, but reporters at the Daily Mail identified him: “The ‘quiet’ teenager, named locally as Jordan Lee-Bevan, was arrested during a raid at his semi-detached home in Southport, Merseyside, today, with officers seizing computers as he was taken away in a police car.”

In 2016 teenager Zachary Buchta from Maryland was also arrested for his role in Lizard Squad and another group called PoodleCorp. As a boy he had been warned in 2014 about his criminal path by police who had caught him carrying out minor cybercrime activity. But he was undeterred and even changed his Twitter profile at one stage to @fbiarelosers to taunt the cops.

At the same time that Buchta was arrested, Dutch police raided and arrested another 19-year-old. Bradley van Rooy, who used the names “Uchiha” or “UchihaLS,” was accused of conspiring with other members of Lizard Squad to operate websites that provided cyberattack-for-hire services, facilitating thousands of DDoS attacks and trafficking stolen payment card account information for thousands of victims.

Bradley was put on bail for two years and eventually given a two-year suspended sentence and 180 hours of community service. The vast majority of charges against him were dropped as they had taken place when he was a minor. He ended up being convicted of the DDoS-for-hire operation and handling stolen credit cards. I tracked him down, and he openly talked about that period of his life, which he had put behind him a long time ago. “I’m now 27, and I see the damage that I did and understand that there could have been a higher punishment,” he says. “But then I also see that I was just a kid, and I had a troubled time at school and just fell into the hacking life after meeting the wrong people when I was playing the game _RuneScape_.”

Bradley’s journey and words track so perfectly to the experiences of almost every hacker I have met or interviewed. It’s as though there is a universal constant, whereby a subset of gamers in every generation is pulled into cybercrime in exactly the same way. There are literally billions of gamers in the world, so these people represent only a tiny fraction. But it seems to be inevitable and cyclical as hacker groups rise and fall.

The differentiating and more important aspect, though, is how these boys and young men react when they cross the line and are caught.

So what of Julius Kivimäki, aka “Ryan,” aka “Ryan Cleary” and many other aliases including the by now infamous “Zeekill”?

Surely, after appearing on TV and radio admitting that he was part of the gang, he too would be rearrested sharpish? Officers did indeed visit Kivimäki to interview him, but they did not arrest him—contrary to reports in the international media. It’s not clear why they took no further action, but perhaps when the teenager confidently said that police would find nothing on his computer he was right. “They’d have to let me go,” he had cockily asserted in our interview. If so, maybe his run-in with police years earlier had taught him to cover his tracks more effectively. Or maybe he hadn’t taken as much of a leading role in the DDoS attacks as he had claimed.

For Finnish cybercrime cop Antti Kurittu, seeing Kivimäki on TV was especially galling. Antti had raided and arrested Kivimaki two years earlier for other cyberattacks carried out with a different teenage cyber gang called HTP. “I remember watching your Sky News interview and just thinking ‘wow, this guy is not even trying to cover up his crimes. He’s just a different sort of person,’” Antti recalls.

It wasn’t until July 2015 that Kivimäki received his first criminal conviction. He was found guilty of the rather preposterous total of 50,700 instances of aggravated computer break-ins—one for every computer enslaved into HTPs botnet. He was also convicted of other offenses including data breach, money laundering, and being in possession of, and using, stolen credit cards. For all of these offenses, he was handed a two-year suspended sentence. If he had been an adult he could have got years behind bars, but as a minor and first-time offender he served no time in prison. So Kivimäki, just a few weeks from his 18th birthday, remained free. He began calling himself the “Untouchable Hacker God” on Twitter.

A year after Kivimäki’s sentencing, in a bizarre coincidence, Antti bumped into Kivimäki in Amsterdam. It was April 2016 and Antti was walking through the departures lounge of Schiphol Airport when he passed the by-then 18-year-old. Antti did a double take, gobsmacked to see him. It was so surreal that they both found it amusing and took a selfie. After a short chat, Antti asked Kivimäki if he was now “staying out of trouble.” Kivimäki replied, “Of course.” But when Antti asked him for a contact email address, he made one up with “@FBI.gov” at the end. They laughed and went their separate ways.

But, as Antti predicted, the Untouchable Hacker God would be back. Four years later he was. And this time he was linked to the cruelest cyberattack in history and had a new alias: ransom\_man.

_Excerpt adapted from_ Ctrl+Alt+Chaos: How Teenage Hackers Hijack the Internet _by Joe Tidy. Published by arrangement with Elliott & Thompson. Copyright © 2025 by Joe Tidy._

What Really Happened in the Aftermath of the Lizard Squad Hacks

Shift in cyberattack focus puts APAC region under growing pressure.

India, China and the US were the top DDoS attacks targets in Q1 2025, with APAC facing over half of global attacks, according to new data from cybersecurity firm StormWall.

A new report from cybersecurity firm StormWall reveals that nearly half of all DDoS attacks in the first quarter of 2025 were aimed at China, India and the United States. Instead of focusing heavily on the usual targets, attackers are now directing more of their efforts toward infrastructure in the Asia-Pacific region.

According to StormWall’s analytics center, India topped the chart with 18.1% of the global DDoS traffic, followed by China at 16.2% and the US at 14.7%. Japan (12.3%) and Taiwan (10.2%) rounded out the top five. When it comes to industry-wise attacks, Telecommunications became the top target in APAC, with 136% year-over-year (YOY) growth.

Four of the five most targeted countries now sit in the APAC region, with 57% of all malicious requests focused there. This shows that attackers are moving their focus away from the usual targets in Europe and North America, at least for now. The reasons may be geopolitical, economic, or a combination of both.

“You can always count on US targets attracting a lot of attention,” said Ramil Khantimirov, founder of StormWall. It’s the world’s largest GDP and hackers are always going to target that, but we’ve never seen so much activity in APAC and so densely concentrated.”

According to StormWall’s report shared with Hackread.com ahead of publishing on Thursday, the main force behind these attacks is botnets. These networks of infected devices were responsible for nearly 70% of all DDoS traffic tracked by StormWall in the first quarter of 2025.

Botnets, often run by state-sponsored groups, hacktivists, or organized cyber criminals, allow attackers to direct massive traffic at targeted systems. One such botnet identified in the report, named “Eleven11bot,” used a network of 86,000 compromised IP cameras and DVRs. It was frequently used in politically motivated campaigns.

While APAC faced an increase in DDoS attacks, other regions haven’t been spared. Belgium, though much smaller, experienced significant attacks, with 9.7% of global DDoS activity aimed at its national digital infrastructure, including MyGov.be and the Walloon Parliament. Saudi Arabia was also hit hard, at 6.8%, largely due to pro-Palestinian attacks linked to ongoing regional tensions.

Countries like Italy, Russia, and Switzerland appeared further down the list with lower attack volumes, but experts caution that even minor increases in activity can pose serious threats to unprepared networks.

Via StormWall

StormWall’s data paints a picture of a fast-evolving threat environment, driven by automation, political motives, and shifting strategic interests. While botnet-powered campaigns grow in scale, the need for mitigation services is more important than ever.

However, separate research from NordPass shows that many industries still fall short on basic cybersecurity. In most cases, weak and easily guessed passwords like 123456 and passwords@, are still in use, making systems vulnerable to breaches and turning devices into part of larger botnets.

StormWall Reveals India, China and US Faced Most DDoS Attacks in Q1 2025

Thousands of ASUS routers have been infected and are believed to be part of a wide-ranging ORB network affecting devices from Linksys, D-Link, QNAP, and Araknis Network.

Tag

#botnet