Insights, news, education and announcements from PolySwarm (3)

Kimwolf Botnet Targeting Android TV Devices Worldwide

Jan 9, 2026 9:46:08 AM / by The Hivemind posted in Threat Bulletin, Evolving Threat, Android Malware, DDoS Attacks, Kimwolf botnet, IoT vulnerabilities, Aisuru variant

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Verticals Targeted: Consumer Electronics, Residential Networks
Regions Targeted: Brazil, India, United States, Vietnam, Saudi Arabia, Russia, Argentina, South Africa, Philippines, Mexico, Thailand, Indonesia, Morocco, Turkey, Iraq, Pakistan, China
Related Families: Aisuru

Executive Summary

Security researchers have detailed the Kimwolf botnet, a massive Android-based network exceeding 1.8 million infected devices, primarily TV boxes, enabling DDoS attacks, proxy services, and other malicious activities through exploitation of residential proxy networks and device vulnerabilities. This threat demonstrates rapid growth and resilience, leveraging advanced evasion techniques to maintain control and monetize infections.

PolySwarm’s 2025 Year in Review

Jan 5, 2026 1:04:00 PM / by The Hivemind posted in Threat Bulletin, RedLine Stealer, Akira Ransomware, AsyncRAT trojan, VShell backdoor, 2025 malware trends, ransomware 2025, Cl0p ransomware, Qilin ransomware, SocGholish downloader, LummaStealer infostealer

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Verticals Targeted: Multiple
Regions Targeted: Multiple
Related Families: Cl0p, Qilin, SocGholish, Akira, AsyncRAT, LummaStealer, RedLineStealer, VShell

Executive Summary

PolySwarm's 2025 Year in Review spotlights resilient malware that dominated the threat landscape and nation-state espionage from the Big Four. React2Shell (CVE-2025-55182) emerged as the top vulnerability, while AI-driven attacks defined the year's paradigm shift.

RansomHouse Upgrades Its Encryption

Dec 29, 2025 12:26:13 PM / by The Hivemind posted in Threat Bulletin, double extortion, Mario Encryptor, MrAgent Tool, VMware hypervisor, RansomHouse Ransomware, ESXi Targeting, ransomware upgrade, encryption evolution

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Verticals Targeted: Healthcare, Finance, Transportation, Government
Regions Targeted: Not specified
Related Families: MrAgent, Mario

SantaStealer

Dec 23, 2025 12:13:07 PM / by The Hivemind posted in Threat Bulletin, Infostealer, Malware-As-A-Service, Emerging Threat, Windows Malware, credential theft, information stealer, C language malware, SantaStealer

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Verticals Targeted: Not specified
Regions Targeted: Not specified
Related Families: BluelineStealer, ChromElevator

Multiple Threat Actors Leveraging CVE-2025-55182 (React2Shell)

Dec 19, 2025 1:24:26 PM / by The Hivemind posted in Threat Bulletin, Linux backdoor, post-exploitation activity, CVE-2025-55182, React RCE, Next.js vulnerability, KSwapDoor backdoor, Cobalt Strike Linux, EtherRAT

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Verticals Targeted: Technology
Regions Targeted: Unspecified
Related Families: KSwapDoor, EtherRAT, Noodle RAT, SNOWLIGHT, VShell, Cobalt Strike, XMRig, Mirai, Others