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Background for this topic.
A botnet is a network of compromised internet-connected devices controlled remotely by an attacker through malware. These devices, known as bots, receive commands from centralized or decentralized command-and-control (C2) servers to perform coordinated actions such as launching Distributed Denial of Service (DDoS) attacks, sending spam, or distributing additional malware. Botnets vary in size and complexity, often leveraging vulnerabilities in devices or weak authentication to propagate.
In information security, botnets pose significant risks including large-scale service disruptions from DDoS attacks and the unauthorized use of infected devices for malicious activities. Detecting botnet activity involves monitoring network traffic for unusual patterns and identifying communication with known C2 infrastructure. Effective defense includes timely patching of vulnerable systems, blocking C2 domains or IPs based on threat intelligence, and isolating infected hosts to prevent further spread or damage. Coordinated efforts to disrupt botnet infrastructure can reduce their operational impact.
Weekly headline count for the current query.
Botnet Operators Execute First Known Exploit of Nearly Decade-Old FlawOperators behind a botnet picked up on a nearly decade-old flaw in Asus routers allowing an unauthenticated attacker to achieve remote code execution as a root user. VulnCheck began observing exploitation of the Asus vulnerability on May 17.
DOJ Says KimWolf Powered Massive DDoS-for-Hire OperationsU.S. prosecutors charged a Canadian man accused of operating the KimWolf botnet, alleging the DDoS-for-hire platform compromised nearly two million IoT devices and powered attacks that reached record traffic volumes worldwide.
Also, More ClickFix Attacks and Teen Booters Arrested in PolandThis week, Russian hackers targeted Signal and WhatsApp users, permit-fee phishing hit U.S. applicants, ClickFix on WordPress sites, Microsoft patched 80 bugs, a 14K-router botnet, Polish teens held over DDoS tools and Finland warned of Russian, Chinese espionage. North Korean IT workers for hire.
The Campaign Compromises Open-Source Vulnerability to Hack IoT Devices at ScaleSecurity firm CloudSEK has uncovered a botnet campaign that is exploiting the React2Shell vulnerability in the Meta-developed, open-source React framework across a variety of devices since December. The security firm attributed the campaign to RondoDox.
Also: Fortinet Flaws, Aisuru Botnet and Dutch Police Seize Bulletproof Host ServersThis week, the root cause of the Cloudflare outage, active exploitation of Fortinet flaws, Logitech disclosed a data breach, Microsoft headed off a record-breaking botnet attack, Dutch police seized bulletproof hosting servers and Princeton University disclosed a data breach after a phishing attack.
Rhadamanthys, VenomRAT and Elysium Targeted in OperationA multinational law enforcement operation resulted in the arrest of a remote access Trojan operator and the seizure of over 1,000 info stealer and botnet servers. Authorities took down 1,025 servers associated with the Rhadamanthys infostealer, the Venom RAT and a botnet dubbed Elysium.
22-Year-Old Oregon Man Charged With Selling DDoS Attacks Using Mirai VariantFederal prosecutors have charged Oregon man Ethan Foltz, 22, with administering an on-demand service for disrupting websites called "Rapper Bot." Resulting distributed-denial-of-service attacks disrupted DeepSeek and X, as well as the U.S. Department of Defense, which is leading the investigation.
PolarNet Has Hallmarks of an Operational Relay BoxNearly 40,000 enterprise-grade devices and consumer-class routers, IP cameras and more are infected with malware researchers codenamed PolarEdge, controlled by a botnet of the same name, which experts suspect is designed to hide traffic tied to cyberespionage operations.
Hackers Using Amadey Bot to Drops Payloads From Fake GitHub AccountsThreat actors are using public GitHub repositories to host and distribute malware through the Amadey botnet in an ongoing campaign linked to a broader malware-as-a-service operation, Cisco Talos said in a report published Thursday.
A Mirai Offshoot Uses DVR Command Injection Bug to Spread, Hitting 50,000 DevicesA Mirai botnet malware variant is targeting a command injection vulnerability in internet-connected digital video recorders used for CCTV surveillance, enabling attackers to take control of the devices and add them to a botnet. A security researcher first identified the vulnerability in April 2024.
Over 1 Million Infected Off-Brand Android Devices Pose Global Fraud RiskA China-based botnet operation called BADBOX 2.0 has infected more than 1 million off-brand Android smart devices globally. In an alert, the FBI advised consumers to check their home networks for suspicious activity that could be linked to multiple fraud schemes.
Persistent Attack Grants Remote SSH Access via ExploitSomeone - possibly nation-state hackers - appears to be constructing a botnet from thousands of Asus routers in hacking that survives a firmware patch and reboots. Nearly 9,000 routers have been compromised and the number is growing, say researchers.
Stealthy Malware Installs Cryptomining SoftwareA botnet targeting Internet of Things devices works by brute forcing credentials and downloading cryptomining software. Researchers call the botnet "PumaBot," since its malware checks for the string "Pumatronix," the name of a Brazilian manufacturer of surveillance and traffic camera systems.
Police Take Down 300 Servers Worldwide, Neutralize 650 DomainsLaw enforcement in a European-led operation against malware often used as a precursor to ransomware took down 300 servers worldwide, police said Friday. The crackdown is the latest action under Operation Endgame targeting ransomware and botnet ecosystem.
Police Take Down 300 Servers Worldwide, Neutralize 650 DomainsLaw enforcement in a European-led operation against malware often used as a precursor to ransomware took down 300 servers worldwide, police said Friday. The crackdown is the latest action under Operation Endgame targeting ransomware and botnet ecosystem.
Russian, Kazakh Hackers Charged in $46M Proxy Botnet SchemeFederal prosecutors charged four hackers for running a proxy botnet that exploited infected routers, using domains like Anyproxy.net to resell U.S. network access globally - and generating over $46M before a coordinated international takedown, according to a Friday indictment.
Also: Iberian Blackout, Delta Faces Lawsuit Linked to CrowdStrike OutageEvery week, ISMG rounds up cybersecurity incidents and breaches around the world. This week: Mirai Botnet Exploits Flaws in GeoVision, the Iberian blackout under investigation, dueling cybersecurity advisories from India and Pakistan, Delta must face a lawsuit linked to CrowdStrike outage.
Experts Express Surprise Over Major Social Platform Falling Victim to DDoS AttacksOne of the world's biggest social networks continued to face intermittent outages Tuesday, apparently due to unsophisticated, distributed denial-of-service attacks. Experts said the attacks were traced to malware-infected devices - many based in the U.S. - and pro-Palestinian hacktivists.
Also, BianLian Ransomware Hackers Aren't Really Mailing YouThis week, the U.S. sanctioned the Nemesis admin, Poco RAT spotted in Latin America, Apple challenged a British order to weaken encryption and the FBI warned against scam letters purportedly from BianLian. Also, a Nigerian tax scammer extradited to the U.S., a new botnet and a Webex vulnerability.
Off-Brand Android Devices Come Infrected With A TrojanA botnet infected more than 1 million off-brand Android devices manufactured in China, reached consumers with a backdoor already installed. Scammers used the devices for programmatic ad fraud, click fraud and converting the devices into a residential proxy.