The Wall Street Journal shares the "wild behind-the-scenes story" of how the world's largest and most destructive botnet was uncovered and taken down, writes Slashdot reader sturgeon. "At times, the network known as Kimwolf included more than a million compromised home Android devices and digital photo frames -- enough DDoS firepower to disrupt internet traffic across the U.S. and beyond." From the report: Sitting in his dorm room at the Rochester Institute of Technology, Benjamin Brundage was closing in on a mystery that had even seasoned internet investigators baffled. A cat meme helped him crack the case. A growing network of hacked devices was launching the biggest cyberattacks ever seen on the internet. It had become the most powerful cyberweapon ever assembled, large enough to knock a state or even a small country offline. Investigators didn't know exactly who had built it -- or how. Brundage had been following the attacks, too -- and, in between classes, was conducting his own investigation. In September, the college senior started messaging online with an anonymous user who seemed to have insider knowledge.

As they chatted on Discord, a platform favored by videogamers, Brundage was eager to get more information, but he didn't want to come off as too serious and shut down the conversation. So every now and then he'd send a funny GIF to lighten the mood. Brundage was fluent in the memes, jokes and technical jargon popular with young gamers and hackers who are extremely online. "It was a bit of just asking over and over again and then like being a bit unserious," said Brundage. At one point, he asked for some technical details. He followed up with the cat meme: a six-second clip that showed a hand adjusting a necktie on a fluffy gray cat. Brundage didn't expect it to work, but he got the information. "It took me by surprise," he said.

Eventually the leaker hinted there was a new vulnerability on the internet. Brundage, who is 22, would learn it threatened tens of millions of consumers and as much as a quarter of the world's corporations. As he unraveled the mystery, he impressed veteran researchers with his findings -- including federal law enforcement, which took action against the network two weeks ago. Chad Seaman, a researcher at Akamai, joked at one point that the internet could go down if Brundage spent too much time on his exams.

An anonymous reader quotes a report from Ars Technica: Researchers say they have uncovered a takedown-resistant botnet of 14,000 routers and other network devices -- primarily made by Asus -- that have been conscripted into a proxy network that anonymously carries traffic used for cybercrime. The malware -- dubbed KadNap -- takes hold by exploiting vulnerabilities that have gone unpatched by their owners, Chris Formosa, a researcher at security firm Lumen's Black Lotus Labs, told Ars. The high concentration of Asus routers is likely due to botnet operators acquiring a reliable exploit for vulnerabilities affecting those models. He said it's unlikely that the attackers are using any zero-days in the operation.

The number of infected routers averages about 14,000 per day, up from 10,000 last August, when Black Lotus discovered the botnet. Compromised devices are overwhelmingly located in the US, with smaller populations in Taiwan, Hong Kong, and Russia. One of the most salient features of KadNap is a sophisticated peer-to-peer design based on Kademlia (PDF), a network structure that uses distributed hash tables to conceal the IP addresses of command-and-control servers. The design makes the botnet resistant to detection and takedowns through traditional methods.

[...] Despite the resistance to normal takedown methods, Black Lotus says it has devised a means to block all network traffic to or from the control infrastructure." The lab is also distributing the indicators of compromise to public feeds to help other parties block access. [...] People who are concerned their devices are infected can check this page for IP addresses and a file hash found in device logs. To disinfect devices, they must be factory reset. Because KadNap stores a shell script that runs when an infected router reboots, simply restarting the device will result in it being compromised all over again. Device owners should also ensure all available firmware updates have been installed, that administrative passwords are strong, and that remote access has been disabled unless needed.

An anonymous reader quotes a report from Security Affairs: On October 24, 2025, Azure DDoS Protection detected and mitigated a massive multi-vector attack peaking at 15.72 Tbps and 3.64 billion pps, the largest cloud DDoS ever recorded, aimed at a single Australian endpoint. Azure's global protection network filtered the traffic, keeping services online. The attack came from the Aisuru botnet, a Turbo Mirai-class IoT botnet using compromised home routers and cameras.

The attack used massive UDP floods from more than 500,000 IPs hitting a single public address, with little spoofing and random source ports that made traceback easier. It highlights how attackers are scaling with the internet: faster home fiber and increasingly powerful IoT devices keep pushing DDoS attack sizes higher. "On October 24, 2025, Azure DDOS Protection automatically detected and mitigated a multi-vector DDoS attack measuring 15.72 Tbps and nearly 3.64 billion packets per second (pps). This was the largest DDoS attack ever observed in the cloud and it targeted a single endpoint in Australia," reads a report published by Microsoft. "The attack originated from Aisuru botnet."

"Attackers are scaling with the internet itself. As fiber-to-the-home speeds rise and IoT devices get more powerful, the baseline for attack size keeps climbing," concludes the post. "As we approach the upcoming holiday season, it is essential to confirm that all internet-facing applications and workloads are adequately protected against DDOS attacks."

An anonymous reader quotes a report from KrebsOnSecurity: The world's largest and most disruptive botnet is now drawing a majority of its firepower from compromised Internet-of-Things (IoT) devices hosted on U.S. Internet providers like AT&T, Comcast and Verizon, new evidence suggests. Experts say the heavy concentration of infected devices at U.S. providers is complicating efforts to limit collateral damage from the botnet's attacks, which shattered previous records this week with a brief traffic flood that clocked in at nearly 30 trillion bits of data per second.

Since its debut more than a year ago, the Aisuru botnet has steadily outcompeted virtually all other IoT-based botnets in the wild, with recent attacks siphoning Internet bandwidth from an estimated 300,000 compromised hosts worldwide. The hacked systems that get subsumed into the botnet are mostly consumer-grade routers, security cameras, digital video recorders and other devices operating with insecure and outdated firmware, and/or factory-default settings. Aisuru's owners are continuously scanning the Internet for these vulnerable devices and enslaving them for use in distributed denial-of-service (DDoS) attacks that can overwhelm targeted servers with crippling amounts of junk traffic.

As Aisuru's size has mushroomed, so has its punch. In May 2025, KrebsOnSecurity was hit with a near-record 6.35 terabits per second (Tbps) attack from Aisuru, which was then the largest assault that Google's DDoS protection service Project Shield had ever mitigated. Days later, Aisuru shattered that record with a data blast in excess of 11 Tbps. By late September, Aisuru was publicly flexing DDoS capabilities topping 22 Tbps. Then on October 6, its operators heaved a whopping 29.6 terabits of junk data packets each second at a targeted host. Hardly anyone noticed because it appears to have been a brief test or demonstration of Aisuru's capabilities: The traffic flood lasted less only a few seconds and was pointed at an Internet server that was specifically designed to measure large-scale DDoS attacks.

Aisuru's overlords aren't just showing off. Their botnet is being blamed for a series of increasingly massive and disruptive attacks. Although recent assaults from Aisuru have targeted mostly ISPs that serve online gaming communities like Minecraft, those digital sieges often result in widespread collateral Internet disruption. For the past several weeks, ISPs hosting some of the Internet's top gaming destinations have been hit with a relentless volley of gargantuan attacks that experts say are well beyond the DDoS mitigation capabilities of most organizations connected to the Internet today.

Cloudflare blocked the largest-ever DDoS attack against a European network infrastructure company, which peaked at 22.2 Tbps and 10.6 Bpps. The hyper-volumetric attack has been linked to the Aisuru botnet and lasted just 40 seconds, but was double the size of the previous record. SecurityWeek reports: Cloudflare told SecurityWeek that the attack was aimed at a single IP address of an unnamed European network infrastructure company. Cloudflare has yet to determine who was behind the attack, but believes it may have been powered by the Aisuru botnet, which was also linked earlier this year to a massive 6.3 Tbps attack on the website of cybersecurity blogger Brian Krebs. Aisuru has been around for more than a year. The botnet is powered by hacked IoT devices such as routers and DVRs that have been compromised through the exploitation of known and zero-day vulnerabilities.

According to Cloudflare, the 22 Tbps attack was traced to over 404,000 unique source IPs across over 14 ASNs worldwide. "Based on internal analysis using a proprietary system, the source IPs were not spoofed," the company explained. The security firm described it as a UDP carpet bomb attack targeting an average of 31,000 destination ports per second, with a peak of 47k ports, all of a single IP address. Cloudflare revealed in July that the number of DDoS attacks it blocked in the first half of 2025 had already exceeded all the attacks mitigated in 2024.

"Some joyless ne'er-do-well has loosed a botnet on the community-driven Arch Linux distro," reports the Register, with a distributed denial of service (DDoS) attack that apparently started a week ago.

Arch maintainer Cristian Heusel announced Thursday on the project's web site that the attack "primarily impacts our main webpage, the Arch User Repository (AUR), and the Forums." We are aware of the problems that this creates for our end users and will continue to actively work with our hosting provider to mitigate the attack. We are also evaluating DDoS protection providers while carefully considering factors including cost, security, and ethical standards... As a volunteer-driven project, we appreciate the community's patience as our DevOps team works to resolve these issues.
A status update Friday acknowledged "we are suffering from partial outages." The Register reports: The attack comes as the project has been enjoying a boost in mainstream success. The distro was picked by Valve to underpin the SteamOS software running on its Steam Deck handheld gaming gadget, with the company providing the project with funding for further development. Late last year, a new version of the archinstall tool was released, with a view to making the system more friendly to newcomers...

For now, the Arch team is working to mitigate the attack's impact, which highlights a bootstrapping issue. Tools designed to shift traffic to mirrors in the event the main infrastructure is unavailable rely on a mirror list obtained from that same main infrastructure, with Heusel advising that users should "default to the mirrors listed in the pacman-mirrorlist package" if tools like reflector fail. Installation media can be downloaded from a range of mirrors, too, but should be checked against the project's official signing key before being trusted.

A 22-year-old Oregon man has been charged with operating one of the most powerful botnets ever recorded. The network, known as Rapper Bot, launched over 370,000 DDoS attacks worldwide, including against X, DeepSeek, U.S. tech firms, and even Defense Department systems. It was allegedly operated by Ethan Foltz of Eugene, Oregon. The Wall Street Journal reports: Foltz faces a maximum of 10 years in prison on a charge of abetting computer intrusions, the Justice Department said in a news release. Rapper Bot was made up of tens of thousands of hacked devices and was capable of flooding victims' websites with enough junk internet traffic to knock them offline, an attack known as a distributed denial of service, or DDoS.

In February, the networking company Nokia measured a Rapper Bot attack against a gaming platform at 6.5 trillion bits per second, well above the several hundred million bits a second of the average high-speed internet connection. "This would place Rapper Bot among the most powerful DDoS botnets to have ever existed," said a criminal complaint that the prosecutors filed Tuesday in a federal court in Alaska. Investigators said Rapper Bot's attacks were so powerful that they were able to overwhelm all but the most robust networks.

Foltz allegedly rented out Rapper Bot to paying customers, including gambling website operators who would use the network in extortion attempts, according to the complaint. The botnet was used to launch more than 370,000 attacks in 80 countries, including China, Japan and the U.S., prosecutors said. It launched its attacks from hacked routers, digital video recorders and cameras, not from computers. [...] "At its height, it mobilized tens of thousands of devices, many with no prior role in DDoS," said Jerome Meyer, a researcher with Nokia's Deepfield network-analysis division. "Taking it down removes a major source of the largest attacks we see."

Google has filed a lawsuit to dismantle the sprawling Badbox 2.0 botnet, which infected over 10 million Android devices with pre-installed malware. Badbox 2.0 "is already the largest known botnet of internet-connected TV devices, and it grows each day. It has harmed millions of victims in the United States and around the world and threatens many more," Google said in its complaint. SecurityWeek reports: The internet giant cautions that, while it has been used mainly for fraud, the botnet could be used for more harmful types of cybercrime, such as ransomware or distributed denial-of-service (DDoS) attacks. In addition to pre-installing the malware on devices, Badbox 2.0's operators also tricked users into installing infected applications that provided them with further access to their personal devices, Google says. As part of their operation, the individuals behind Badbox 2.0 sold access to the infected devices to be used as residential proxies, and conducted ad fraud schemes by abusing these devices to create fake ad views or to exploit pay-per-click compensation models, the company continues. The internet giant also points out that this is the second global botnet the perpetrators have built, after the initial Badbox botnet was disrupted by German law enforcement in 2023.

According to Google, Badbox 2.0 is operated by multiple cybercrime groups from China, each having a different role in maintaining the botnet, such as establishing infrastructure, developing and pre-installing the malware on devices, and conducting fraud. "The BadBox 2.0 Enterprise includes several connected threat actor groups that design and implement complex criminal schemes targeting internet-connected devices both before and after the consumer receives the device," Google says. "While each member of the Enterprise plays a distinct role, they all collaborate to execute the BadBox 2.0 Scheme. All of the threat actor groups are connected to one another through the BadBox 2.0 shared C2 infrastructure and historical and current business ties," the company continues.

The Free Software Foundation's services face "ongoing (and increasing) distributed denial of service (DDoS) attacks," senior systems administrator Ian Kelling wrote Wednesday. But "Even though we are under active attack, gnu.org, ftp.gnu.org, and savannah.gnu.org are up with normal response times at the moment, and have been for the majority of this week, largely thanks to hard work from the Savannah hackers Bob, Corwin, and Luke who've helped us, your sysadmins."

"We've shielded these sites for almost a full year of intense attacks now, and we'll keep on fighting these attacks for as long as they continue." Our infrastructure has been under attack since August 2024. Large Language Model (LLM) web crawlers have been a significant source of the attacks, and as for the rest, we don't expect to ever know what kind of entity is targeting our sites or why.

- In the fall Bulletin, we wrote about the August attack on gnu.org. That attack continues, but we have mitigated it. Judging from the pattern and scope, the goal was likely to take the site down and it was not an LLM crawler. We do not know who or what is behind the attack, but since then, we have had more attacks with even higher severity.

- To begin with, GNU Savannah, the FSF's collaborative software development system, was hit by a massive botnet controlling about five million IPs starting in January. As of this writing, the attack is still ongoing, but the botnet's current iteration is mitigated. The goal is likely to build an LLM training dataset. We do not know who or what is behind this.

- Furthermore, gnu.org and ftp.gnu.org were targets in a new DDoS attack starting on May 27, 2025. Its goal seems to be to take the site down. It is currently mitigated. It has had several iterations, and each has caused some hours of downtime while we figured out how to defend ourselves against it. Here again, the goal was likely to take our sites down and we do not know who or what is behind this.

- In addition, directory.fsf.org, the server behind the Free Software Directory, has been under attack since June 18. This likely is an LLM scraper designed to specifically target Media Wiki sites with a botnet. This attack is very active and now partially mitigated...

Even though we are under active attack, gnu.org, ftp.gnu.org, and savannah.gnu.org are up with normal response times at the moment, and have been for the majority of this week, largely thanks to hard work from the Savannah hackers Bob, Corwin, and Luke who've helped us, your sysadmins. We've shielded these sites for almost a full year of intense attacks now, and we'll keep on fighting these attacks for as long as they continue.
The full-time FSF tech staff is just two systems administrators, "and we currently lack the funds to hire more tech staff any time soon," Kelling points out. Kelling titled his post "our small team vs millions of bots," suggesting that supporters purchase FSF memberships "to improve our staffing situation... Can you join us in our crucial work to guard user freedom and defy dystopia?"

Kelling also points out they're also facing "run-of-the-mill standard crawlers, SEO crawlers, crawlers pretending to be normal users, crawlers pretending to be other crawlers, uptime systems, vulnerability scanners, carrier-grade network address translation, VPNs, and normal browsers hitting our sites..."

"Some of the abuse is not unique to us, and it seems that the health of the web has some serious problems right now."

An anonymous reader quotes a report from Ars Technica: Large-scale attacks designed to bring down Internet services by sending them more traffic than they can process keep getting bigger, with the largest one yet, measured at 7.3 terabits per second, being reported Friday by Internet security and performance provider Cloudflare. The 7.3Tbps attack amounted to 37.4 terabytes of junk traffic that hit the target in just 45 seconds. That's an almost incomprehensible amount of data, equivalent to more than 9,300 full-length HD movies or 7,500 hours of HD streaming content in well under a minute.

Cloudflare said the attackers "carpet bombed" an average of nearly 22,000 destination ports of a single IP address belonging to the target, identified only as a Cloudflare customer. A total of 34,500 ports were targeted, indicating the thoroughness and well-engineered nature of the attack. [...] Cloudflare said the record DDoS exploited various reflection or amplification vectors, including the previously mentioned Network Time Protocol; the Quote of the Day Protocol, which listens on UDP port 17 and responds with a short quote or message; the Echo Protocol, which responds with the same data it receives; and Portmapper services used identify resources available to applications connecting through the Remote Procedure Call. Cloudflare said the attack was also delivered through one or more Mirai-based botnets. Such botnets are typically made up of home and small office routers, web cameras, and other Internet of Things devices that have been compromised.

An anonymous reader quotes a report from BleepingComputer: The FBI is warning that the BADBOX 2.0 malware campaign has infected over 1 million home Internet-connected devices, converting consumer electronics into residential proxies that are used for malicious activity. The BADBOX botnet is commonly found on Chinese Android-based smart TVs, streaming boxes, projectors, tablets, and other Internet of Things (IoT) devices. "The BADBOX 2.0 botnet consists of millions of infected devices and maintains numerous backdoors to proxy services that cyber criminal actors exploit by either selling or providing free access to compromised home networks to be used for various criminal activity," warns the FBI.

These devices come preloaded with the BADBOX 2.0 malware botnet or become infected after installing firmware updates and through malicious Android applications that sneak onto Google Play and third-party app stores. "Cyber criminals gain unauthorized access to home networks by either configuring the product with malicious software prior to the users purchase or infecting the device as it downloads required applications that contain backdoors, usually during the set-up process," explains the FBI. "Once these compromised IoT devices are connected to home networks, the infected devices are susceptible to becoming part of the BADBOX 2.0 botnet and residential proxy services4 known to be used for malicious activity."

Once infected, the devices connect to the attacker's command and control (C2) servers, where they receive commands to execute on the compromised devices, such as [routing malicious traffic through residential IPs to obscure cybercriminal activity, performing background ad fraud to generate revenue, and launching credential-stuffing attacks using stolen login data]. Over the years, the malware botnet continued expanding until 2024, when Germany's cybersecurity agency disrupted the botnet in the country by sinkholing the communication between infected devices and the attacker's infrastructure, effectively rendering the malware useless. However, that did not stop the threat actors, with researchers saying they found the malware installed on 192,000 devices a week later. Even more concerning, the malware was found on more mainstream brands, like Yandex TVs and Hisense smartphones. Unfortunately, despite the previous disruption, the botnet continued to grow, with HUMAN's Satori Threat Intelligence stating that over 1 million consumer devices had become infected by March 2025. This new larger botnet is now being called BADBOX 2.0 to indicate a new tracking of the malware campaign. "This scheme impacted more than 1 million consumer devices. Devices connected to the BADBOX 2.0 operation included lower-price-point, 'off brand,' uncertified tablets, connected TV (CTV) boxes, digital projectors, and more," explains HUMAN.

"The infected devices are Android Open Source Project devices, not Android TV OS devices or Play Protect certified Android devices. All of these devices are manufactured in mainland China and shipped globally; indeed, HUMAN observed BADBOX 2.0-associated traffic from 222 countries and territories worldwide."

An anonymous reader quotes a report from SC Media: Thousands of ASUS routers have been compromised with malware-free backdoors in an ongoing campaign to potentially build a future botnet, GreyNoise reported Wednesday. The threat actors abuse security vulnerabilities and legitimate router features to establish persistent access without the use of malware, and these backdoors survive both reboots and firmware updates, making them difficult to remove.

The attacks, which researchers suspect are conducted by highly sophisticated threat actors, were first detected by GreyNoise's AI-powered Sift tool in mid-March and disclosed Thursday after coordination with government officials and industry partners. Sekoia.io also reported the compromise of thousands of ASUS routers in their investigation of a broader campaign, dubbed ViciousTrap, in which edge devices from other brands were also compromised to create a honeypot network. Sekoia.io found that the ASUS routers were not used to create honeypots, and that the threat actors gained SSH access using the same port, TCP/53282, identified by GreyNoise in their report. The backdoor campaign affects multiple ASUS router models, including the RT-AC3200, RT-AC3100, GT-AC2900, and Lyra Mini.

GreyNoise advises users to perform a full factory reset and manually reconfigure any potentially compromised device. To identify a breach, users should check for SSH access on TCP port 53282 and inspect the authorized_keys file for unauthorized entries.

KrebsOnSecurity was hit with a near-record 6.3 Tbps DDoS attack, believed to be a test of the powerful new Aisuru IoT botnet. The attack, lasting under a minute, was the largest Google has ever mitigated and is linked to a DDoS-for-hire operation run by a 21-year-old Brazilian known as "Forky." Brian Krebs writes: [Google Security Engineer Damian Menscher] said the attack on KrebsOnSecurity lasted less than a minute, hurling large UDP data packets at random ports at a rate of approximately 585 million data packets per second. "It was the type of attack normally designed to overwhelm network links," Menscher said, referring to the throughput connections between and among various Internet service providers (ISPs). "For most companies, this size of attack would kill them." [...]

The 6.3 Tbps attack last week caused no visible disruption to this site, in part because it was so brief -- lasting approximately 45 seconds. DDoS attacks of such magnitude and brevity typically are produced when botnet operators wish to test or demonstrate their firepower for the benefit of potential buyers. Indeed, Google's Menscher said it is likely that both the May 12 attack and the slightly larger 6.5 Tbps attack against Cloudflare last month were simply tests of the same botnet's capabilities. In many ways, the threat posed by the Aisuru/Airashi botnet is reminiscent of Mirai, an innovative IoT malware strain that emerged in the summer of 2016 and successfully out-competed virtually all other IoT malware strains in existence at the time.

An anonymous reader quotes a report from BleepingComputer: Law enforcement authorities have dismantled a botnet that infected thousands of routers over the last 20 years to build two networks of residential proxies known as Anyproxy and 5socks. The U.S. Justice Department also indicted three Russian nationals (Alexey Viktorovich Chertkov, Kirill Vladimirovich Morozov, and Aleksandr Aleksandrovich Shishkin) and a Kazakhstani (Dmitriy Rubtsov) for their involvement in operating, maintaining, and profiting from these two illegal services.

During this joint action dubbed 'Operation Moonlander,' U.S. authorities worked with prosecutors and investigators from the Dutch National Police, the Netherlands Public Prosecution Service (Openbaar Ministerie), and the Royal Thai Police, as well as analysts with Lumen Technologies' Black Lotus Labs. Court documents show that the now-dismantled botnet infected older wireless internet routers worldwide with malware since at least 2004, allowing unauthorized access to compromised devices to be sold as proxy servers on Anyproxy.net and 5socks.net. The two domains were managed by a Virginia-based company and hosted on servers globally.

On Wednesday, the FBI also issued a flash advisory (PDF) and a public service announcement warning that this botnet was targeting patch end-of-life (EoL) routers with a variant of the TheMoon malware. The FBI warned that the attackers are installing proxies later used to evade detection during cybercrime-for-hire activities, cryptocurrency theft attacks, and other illegal operations. The list of devices commonly targeted by the botnet includes Linksys and Cisco router models, including:

- Linksys E1200, E2500, E1000, E4200, E1500, E300, E3200, E1550
- Linksys WRT320N, WRT310N, WRT610N
- Cisco M10 and Cradlepoint E100 "The botnet controllers require cryptocurrency for payment. Users are allowed to connect directly with proxies using no authentication, which, as documented in previous cases, can lead to a broad spectrum of malicious actors gaining free access," Black Lotus Labs said. "Given the source range, only around 10% are detected as malicious in popular tools such as VirusTotal, meaning they consistently avoid network monitoring tools with a high degree of success. Proxies such as this are designed to help conceal a range of illicit pursuits including ad fraud, DDoS attacks, brute forcing, or exploiting victim's data."

An anonymous reader quotes a report from Ars Technica: A technique that hostile nation-states and financially motivated ransomware groups are using to hide their operations poses a threat to critical infrastructure and national security, the National Security Agency has warned. The technique is known as fast flux. It allows decentralized networks operated by threat actors to hide their infrastructure and survive takedown attempts that would otherwise succeed. Fast flux works by cycling through a range of IP addresses and domain names that these botnets use to connect to the Internet. In some cases, IPs and domain names change every day or two; in other cases, they change almost hourly. The constant flux complicates the task of isolating the true origin of the infrastructure. It also provides redundancy. By the time defenders block one address or domain, new ones have already been assigned.

"This technique poses a significant threat to national security, enabling malicious cyber actors to consistently evade detection," the NSA, FBI, and their counterparts from Canada, Australia, and New Zealand warned Thursday. "Malicious cyber actors, including cybercriminals and nation-state actors, use fast flux to obfuscate the locations of malicious servers by rapidly changing Domain Name System (DNS) records. Additionally, they can create resilient, highly available command and control (C2) infrastructure, concealing their subsequent malicious operations." There are two variations of fast flux described in the advisory: single flux and double flux. Single flux involves mapping a single domain to a rotating pool of IP addresses using DNS A (IPv4) or AAAA (IPv6) records. This constant cycling makes it difficult for defenders to track or block the associated malicious servers since the addresses change frequently, yet the domain name remains consistent.

Double flux takes this a step further by also rotating the DNS name servers themselves. In addition to changing the IP addresses of the domain, it cycles through the name servers using NS (Name Server) and CNAME (Canonical Name) records. This adds an additional layer of obfuscation and resilience, complicating takedown efforts.

"A key means for achieving this is the use of Wildcard DNS records," notes Ars. "These records define zones within the Domain Name System, which map domains to IP addresses. The wildcards cause DNS lookups for subdomains that do not exist, specifically by tying MX (mail exchange) records used to designate mail servers. The result is the assignment of an attacker IP to a subdomain such as malicious.example.com, even though it doesn't exist." Both methods typically rely on large botnets of compromised devices acting as proxies, making it challenging for defenders to trace or disrupt the malicious activity.

The Ballista botnet is actively exploiting a high-severity remote code execution flaw (CVE-2023-1389) in TP-Link Archer AX-21 routers, infecting over 6,000 devices primarily in Brazil, Poland, the UK, Bulgaria, and Turkey. Tom's Hardware reports: According to a new report from the Cato CTRL team, the Ballista botnet exploits a remote code execution vulnerability that directly impacts the TP-Link Archer AX-21 router. The botnet can lead to command injection which then makes remote code execution (RCE) possible so that the malware can spread itself across the internet automatically. This high severity security flaw (tracked as CVE-2023-1389) has also been used to spread other malware families as far back as April 2023 when it was used in the Mirai botnet malware attacks. The flaw also linked to the Condi and AndroxGh0st malware attacks.

Ballista's most recent exploitation attempt was February 17, 2025 and Cato CTRL first detected it on January 10, 2025. Of the thousands of infected devices, the majority of them are concentrated in Brazil, Poland, the United Kingdom, Bulgaria and Turkey; with the botnet targeting manufacturing, medical/healthcare, services and technology organizations in the United States, Australia, China and Mexico.

A survey of 2,130 Americans has revealed widespread vulnerability to cyber attacks through unsupported smart devices, with 43% unaware their devices might lose software support. The security threat was underscored in December 2023 when U.S. authorities disrupted a Chinese state-sponsored botnet targeting home routers and cameras that had stopped receiving security updates. Cloudflare separately reported a record-breaking DDoS attack in late 2023, primarily originating from compromised smart TVs and set-top boxes.

The survey, conduced by Consumer Reports, found that only 39% of consumers learned about lost software support from manufacturers, with most discovering issues when devices stopped working (40%) or through media reports (15%). Most consumers expect their smart devices to retain functionality after losing software support, particularly for large appliances (70%). However, Consumer Reports' research found only 14% of 21 smart appliance brands specify support timeframes, while an FTC study of 184 devices showed just 11% disclose support duration.

Remember that massive botnet run by Chinese government hackers? Flax Typhoon "compromised computer networks in North America, Europe, Africa, and across Asia, with a particular focus on Taiwan," according to the U.S. Treasury Department. (The group's botnet breaching this autumn affected "at least 260,000 internet-connected devices," reports the Washington Post, "roughly half of which were located in the United States.")

Friday America's Treasury Department sanctioned "a Beijing-based cybersecurity company for its role in multiple computer intrusion incidents against U.S. victims..." according to an announcement from the department's Office of Foreign Assets Control. "Between summer 2022 and fall 2023, Flax Typhoon actors used infrastructure tied to Integrity Tech during their computer network exploitation activities against multiple victims. During that time, Flax Typhoon routinely sent and received information from Integrity Tech infrastructure."

From the Washington Post: The group behind the attacks was active since at least 2021, but U.S. authorities only managed to wrest control of the devices from the hackers in September, after the FBI won a court order that allowed the agency to send commands to the infected devices...

Treasury's designation follows sanctions announced last month on Sichuan Silence Information Technology Company, in which U.S. officials accused the company of exploiting technology flaws to install malware in more than 80,000 firewalls, including those protecting U.S. critical infrastructure. The new sanctions on Beijing Integrity Technology are notable due to the company's public profile and outsize role in servicing China's police and intelligence services via state-run hacking competitions. The company, which is listed in Shanghai and has a market capitalization of more than $327 million, plays a central role in providing state agencies "cyber ranges" — technology that allows them to simulate cyberattacks and defenses...

In September, FBI Director Christopher A. Wray said the Flax Typhoon attack successfully infiltrated universities, media organizations, corporations and government agencies, and in some cases caused significant financial losses as groups raced to replace the infected hardware. He said at the time that the operation to shut down the network was "one round in a much longer fight...." A 2024 assessment by the Office of the Director of National Intelligence said China is the most "active and persistent" cyberthreat and that actors under Beijing's direction have made efforts to breach U.S. critical infrastructure with the intention of lying in wait to be able to launch attacks in the event of major conflict.
"The Treasury sanctions bar Beijing Integrity Technology from access to U.S. financial systems and freeze any assets the company might hold in the United States," according to the article, "but the moves are unlikely to have a significant effect on the company," (according to Dakota Cary, a fellow at the Atlantic Council who has studied the company's role in state-sponsored hacking).

"A cyberattack tied to the Chinese government penetrated the networks of a swath of U.S. broadband providers," reports the Wall Street Journal, "potentially accessing information from systems the federal government uses for court-authorized network wiretapping requests.

"For months or longer, the hackers might have held access to network infrastructure used to cooperate with lawful U.S. requests for communications data, according to people familiar with the matter, which amounts to a major national security risk." The attackers also had access to other tranches of more generic internet traffic, they said. Verizon Communications, AT&T and Lumen Technologies are among the companies whose networks were breached by the recently discovered intrusion, the people said.

The widespread compromise is considered a potentially catastrophic security breach and was carried out by a sophisticated Chinese hacking group dubbed Salt Typhoon. It appeared to be geared toward intelligence collection, the people said... The surveillance systems believed to be at issue are used to cooperate with requests for domestic information related to criminal and national security investigations. Under federal law, telecommunications and broadband companies must allow authorities to intercept electronic information pursuant to a court order. It couldn't be determined if systems that support foreign intelligence surveillance were also vulnerable in the breach...

The hackers appear to have engaged in a vast collection of internet traffic from internet service providers that count businesses large and small, and millions of Americans, as their customers. Additionally, there are indications that the hacking campaign targeted a small number of service providers outside the U.S., the people said. A person familiar with the attack said the U.S. government considered the intrusions to be historically significant and worrisome... "It will take time to unravel how bad this is, but in the meantime it's the most significant in a long string of wake-up calls that show how the PRC has stepped up their cyber game," said Brandon Wales, former executive director at the Cybersecurity and Infrastructure Security Agency and now a vice president at SentinelOne, referring to the People's Republic of China. "If companies and governments weren't taking this seriously before, they absolutely need to now."
Three weeks ago TechCrunch also reported that the FBI "took control of a botnet made up of hundreds of thousands of internet-connected devices, such as cameras, video recorders, storage devices, and routers, which was run by a Chinese government hacking group, FBI director Christopher Wray and U.S. government agencies revealed Wednesday.

Ars Technica's Dan Goodin reports: Five years ago, researchers made a grim discovery -- a legitimate Android app in the Google Play market that was surreptitiously made malicious by a library the developers used to earn advertising revenue. With that, the app was infected with code that caused 100 million infected devices to connect to attacker-controlled servers and download secret payloads. Now, history is repeating itself. Researchers from the same Moscow, Russia-based security firm reported Monday that they found two new apps, downloaded from Play 11 million times, that were infected with the same malware family. The researchers, from Kaspersky, believe a malicious software developer kit for integrating advertising capabilities is once again responsible. [...]

The researchers found Necro in two Google Play apps. One was Wuta Camera, an app with 10 million downloads to date. Wuta Camera versions 6.3.2.148 through 6.3.6.148 contained the malicious SDK that infects apps. The app has since been updated to remove the malicious component. A separate app with roughly 1 million downloads -- known as Max Browser -- was also infected. That app is no longer available in Google Play. The researchers also found Necro infecting a variety of Android apps available in alternative marketplaces. Those apps typically billed themselves as modified versions of legitimate apps such as Spotify, Minecraft, WhatsApp, Stumble Guys, Car Parking Multiplayer, and Melon Sandbox. People who are concerned they may be infected by Necro should check their devices for the presence of indicators of compromise listed at the end of this writeup.