Suspicious CloudZ RAT Loader Execution via regasm.exe LOLBin

ATT&CK techniques

Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1218.009Regsvcs/Regasm
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects the regasm.exe LOLBin executing against content staged under ProgramData, matching the CloudZ RAT which abuses regasm to load a dropped .NET assembly outside developer workflows. Legitimate use of regasm operates on assemblies in build or install directories, not ProgramData staging folders. Execution from this location signals proxied malicious code loading.

Reporting behind it

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RegAsm.exe Process Execution Missing Command-Line and Assembly Path (Windows)

Windows RegAsm.exe Initiates Network Connection to Public IP

Windows Suspicious Execution of Regasm/Regsvcs With Uncommon Command-Line Extension

Windows Process Execution of Regasm/Regsvcs from Uncommon Directories

Suspicious CloudZ RAT Loader Execution via regasm.exe LOLBin

Pivot detection · T1218.009 · 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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