PureHVNC Process Hollowing into RegAsm Spawned by PowerShell (via process_creation)

ATT&CK techniques

Priv Esc → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
- T1055.012Process Hollowing
Defense Evasion
- T1055.012Process Hollowing
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects RegAsm being spawned by PowerShell, the process-hollowing target used to run the PureHVNC RAT after a trojanized ScreenConnect installer downloads NvContainerRecovery.ps1. Adversaries inject PureHVNC into the .NET RegAsm host to hide under a trusted binary. RegAsm launched from PowerShell rather than build tooling is highly anomalous.

Reporting behind it

Related detections9 linkedT1055.012 — drag to rearrange

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Possible Process Injection Target RegAsm Launched Without Arguments via Process Creation

In-Memory Regasm Process Hollowing Spawned by PowerShell (via process_creation)

Suspicious AppLaunch.exe Execution as Process Hollowing Target

Suspicious ctfmon.exe Execution With Command-Line Arguments via PikaBot Injection

PureHVNC Process Hollowing into RegAsm Spawned by PowerShell (via process_creation)

Pivot detection · T1055.012 · 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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