Malicious Command Injection via SyncAppvPublishingServer VBS LOLBin (via process_creation)

ATT&CK techniques

Execution → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
- T1059.001PowerShell
Persistence
Priv Esc
Defense Evasion
- T1216System Script Proxy Execution
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects abuse of the SyncAppvPublishingServer.vbs living-off-the-land script to inject PowerShell after a semicolon separator, the ClickFix delivery behavior ClearFake uses to launch a hidden PowerShell downloader from a clipboard-pasted Run command. Adversaries proxy execution through this signed script to evade script-host controls, making early detection critical for catching the infection at the first execution stage.

Reporting behind it

Related detections9 linkedT1059.001 — drag to rearrange

Windows: Code execution via Pester.bat invoked by PowerShell (Invoke-Pester/Get-Help)

Windows: Code Execution via Pester.bat Using PowerShell Help or cmd.exe

Suspicious Scheduled Task Running PowerShell Every Minute (via process_creation)

Malicious Script Host Spawning PowerShell With Invoke-Expression (via process_creation)

Hidden PowerShell Archive Extraction via ExtractToDirectory

CastleLoader ClickFix PowerShell Hex Decode and Re-Execution

Malicious Non-Interactive Encoded PowerShell Stager (via process_creation)

Malicious ActiveMQ Exploitation Java Spawning PowerShell Downloader (via process_creation)

Suspicious Cleo Autorun Health Check File Drop (via file_event)

Malicious Command Injection via SyncAppvPublishingServer VBS LOLBin (via process_creation)

Pivot detection · T1059.001 · 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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