huntrule

Linux ClamAV alerts for Trojan, Webshell, Rootkit, Htran, VirTool detections

Detects ClamAV log entries with keyword-based indicators for Trojans, webshells, rootkits, and Htran.

FreeReviewedSigma · High · v3
Product
linux
Service
clamav
Author
Florian Roth (Nextron Systems) (SigmaHQ), DRL 1.1
Published
2017-03-01
Updated
2026-07-31
AnalysisDetection

ATT&CK techniques

Resource Dev

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule flags ClamAV messages containing specific malware detection strings such as Trojan, VirTool, Webshell, Rootkit, and Htran. Attackers rely on stealth and often drop web-facing or persistent components; timely AV detections help surface these compromises. The detection relies on keyword matching against ClamAV service logs on Linux.

Reporting behind it

Changelog

v3
  1. v3
    Candidate ingested via manual entry.2026-07-31
  2. v2
    Candidate ingested via manual entry.2026-07-31
  3. v1
    No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.