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
ATT&CK techniques
Resource DevRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
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- v3Candidate ingested via manual entry.2026-07-31
- v2Candidate ingested via manual entry.2026-07-31
- v1No 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.
linux-clamav-alerts-keyword-matched-trojan-webshell-rootkit-and-htran-detections-36aa86ca
title: Linux ClamAV alerts for Trojan, Webshell, Rootkit, Htran, VirTool detections
id: c79b0e54-a140-4776-ad7c-15e54ddb5f63
status: stable
description: 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.
references:
- https://github.com/ossec/ossec-hids/blob/1ecffb1b884607cb12e619f9ab3c04f530801083/etc/rules/clam_av_rules.xml
- https://github.com/SigmaHQ/sigma/blob/master/rules/linux/builtin/clamav/lnx_clamav_relevant_message.yml
author: Florian Roth (Nextron Systems), Huntrule Team
date: 2017-03-01
tags:
- attack.resource-development
- attack.t1588.001
logsource:
product: linux
service: clamav
detection:
keywords:
- Trojan*FOUND
- VirTool*FOUND
- Webshell*FOUND
- Rootkit*FOUND
- Htran*FOUND
condition: keywords
falsepositives:
- Unknown
level: high
license: DRL-1.1
related:
- id: 36aa86ca-fd9d-4456-814e-d3b1b8e1e0bb
type: derived