Suspicious PowerShell Execution via SyncAppvPublishingServer LOLBIN

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 signed SyncAppvPublishingServer.vbs script to proxy execution of PowerShell, a technique used in the GuLoader to Remcos infection chain. The LNK lure invokes this LOLBIN to run obfuscated PowerShell that stages shellcode. Detecting the script use surfaces the proxied execution step of the chain.

Reporting behind it

Related detections9 linkedT1059.001 — drag to rearrange

Malicious Command Injection via SyncAppvPublishingServer VBS LOLBin (via process_creation)

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 PowerShell Execution via SyncAppvPublishingServer LOLBIN

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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