Suspicious SSH Reverse Tunnel via Renamed plink Utility on Triofox Host

ATT&CK techniques

Defense Evasion → C2

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1036.005Match Legitimate Resource Name or Location
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1219Remote Access Tools
- T1572Protocol Tunneling
Exfiltration
Impact

What it detects

This rule detects renamed plink or putty binaries sihosts.exe and silcon.exe establishing a reverse SSH tunnel with the -R flag as observed after Triofox exploitation. Attackers proxy RDP over an outbound tunnel to a non standard port to maintain covert remote access.

Reporting behind it

Related detections9 linkedT1572 — drag to rearrange

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Suspicious SSH Reverse Tunnel via Renamed plink Utility on Triofox Host

Pivot detection · T1572 · 9 related

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

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