Suspicious RegSvcs Reflective .NET Load from Fake Update Chain

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 PowerShell spawning RegSvcs.exe which is abused as an injection target for reflectively loaded .NET payloads decoded from disguised png files. This behavior was seen in fake browser update campaigns delivering BitRAT and Lumma Stealer. Attackers pick RegSvcs as a signed host to execute malicious code under a trusted image name.

Reporting behind it

Related detections9 linkedT1055.012 — drag to rearrange

Suspicious RegSvcs Execution Spawned by Script Interpreter for Process Hollowing (via process_creation)

Suspicious MSBuild Execution Spawned by PowerShell via PhantomVAI Loader (via process_creation)

Suspicious Rundll32 Loading Non-DLL Image Extension File

Suspicious MSBuild Execution Spawned by Command Shell for Process Hollowing (via process_creation)

Malicious Desktop Window Manager Impersonation From Non-System Path via process_creation

Suspicious .NET Utility Spawned by AutoHotkey Loader for Process Hollowing (via process_creation)

Suspicious csc.exe Spawned by Document Reader for Process Injection

Suspicious RegAsm Execution Spawned by Script Host for Process Hollowing (via process_creation)

Suspicious .NET Utility Launched as Process Injection Target (via process_creation)

Suspicious RegSvcs Reflective .NET Load from Fake Update Chain

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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