Suspicious Trojanized ScreenConnect Client Installer with Guest Relay Parameters (via process_creation)

ATT&CK techniques

C2

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

What it detects

This rule detects the ScreenConnect client setup executed with the guest session and relay host parameters used by trojanized installers that drop AsyncRAT and PureHVNC on a single machine. Adversaries embed the e Support y Guest and h relay-host arguments so the agent silently connects to attacker infrastructure. The parameter combination distinguishes weaponized installers from legitimate deployments.

Reporting behind it

Related detections9 linkedT1219 — drag to rearrange

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Suspicious AnyDesk Unattended Password Set via Piped Echo

Suspicious Remote Monitoring Tool Executing from GoAnywhere Directory

Suspicious NetSupport Manager Remote Client Execution (via process_creation)

Suspicious ScreenConnect Remote Access Client Spawning PowerShell (via process_creation)

Suspicious Trojanized ScreenConnect Client Installer with Guest Relay Parameters (via process_creation)

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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