Suspicious TightVNC Server Installation as a Service

ATT&CK techniques

Persistence → C2

Recon
Resource Dev
Initial Access
Execution
Persistence
- T1543.003Windows Service
Priv Esc
- T1543.003Windows Service
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1219Remote Access Tools
Exfiltration
Impact

What it detects

This rule detects the TightVNC server tvnserver.exe installed with the -service argument, an unattended remote access mechanism observed in a Huntress-tracked Tiflux campaign that deployed stealth VNC tooling for persistent control. Registering the VNC server as a service enables silent boot-time remote access. Service installation of hidden VNC tooling on endpoints is characteristic of attacker remote access rather than sanctioned support software.

Reporting behind it

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Suspicious TightVNC Server Installation as a Service

Pivot detection · T1219 · 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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