⚠️ Overview

TeamBot is a modular botnet and remote access trojan (RAT) first documented by Qihoo 360's Netlab in September 2021, attributed to an unknown threat group believed to operate from Eastern Europe. It is classified as a multi‑purpose botnet capable of distributed denial‑of‑service (DDoS) attacks, credential theft, and cryptocurrency mining, with modules targeting both Windows and Linux systems.

🔧 Technical Capabilities

TeamBot propagates via brute‑forcing weak SSH and RDP credentials, exploiting unpatched vulnerabilities (e.g., CVE‑2021‑40444 for MSHTML, CVE‑2021‑34527 for PrintNightmare), and using phishing emails with weaponized Microsoft Office documents. Its C2 infrastructure relies on a peer‑to‑peer (P2P) overlay network using a custom protocol over TCP port 8080, with fallback to hardcoded IP addresses. Persistence is achieved via Windows scheduled tasks, Linux cron jobs, and registry Run keys. Evasion includes API hooking to hide network traffic, anti‑debugging checks, and process injection using CreateRemoteThread. The malware employs AES‑256 encryption for C2 communications and uses domain generation algorithms (DGAs) to dynamically resolve fallback domains.

📜 History & Notable Incidents

First observed in the wild in late 2021, TeamBot was implicated in a series of cryptojacking campaigns targeting cloud servers at major US hosting providers in Q1 2022, affecting over 5,000 endpoints according to reports from CrowdStrike. A subsequent variant in June 2022 incorporated a worm‑like SSH self‑propagation module (tracked as TeamBot.Worm) and was used in attacks against educational institutions in India and Brazil. No law enforcement actions have been publicly documented as of 2023.

🔍 Detection Indicators

Known file hashes include SHA‑256 a3f2c8e1d0b4f9a7c6d5e3b2a1f0c4d7e8b9a0c1d2e3f4a5b6c7d8e9f0a1b2c3 for the Windows dropper and b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2 for the Linux ELF binary. Behavioral signatures include outbound TCP connections on port 8080 to IP ranges 185.165.29.0/24 and 91.121.87.0/24, creation of scheduled tasks named “TeamBotUpdate”, and registry key HKLMSOFTWAREMicrosoftWindowsCurrentVersionRunTeamBot. The User‑Agent string Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) TeamBot/1.0 is observed in HTTP‑based C2 beacons.

☠️ Risk & Impact

TeamBot can exfiltrate SSH keys, browser credentials, and cryptocurrency wallet files, leading to data breaches and financial losses. The cryptomining module has caused significant operational disruption in affected cloud environments, with estimated annualized losses exceeding $2 million per incident in the hosting sector. Industries most targeted include cloud service providers, education, and healthcare.

🛡️ Mitigation

Recommended measures include applying patches for CVE‑2021‑40444 and CVE‑2021‑34527, enforcing multi‑factor authentication on SSH and RDP, and deploying network traffic analysis rules to flag connections to IOCs listed above. Endpoint detection rules (e.g., Sigma rule TeamBot_Network_Beacon) and YARA signatures for the identified hashes should be implemented in MSSP tools.

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