Malicious Matanbuchus Persistence via regsvr32 Silent Install with User Context (via process_creation)

ATT&CK techniques

Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1218.010Regsvr32
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects execution of regsvr32 with the no-register and user-context install flags to invoke a DLL entry point, the persistence and execution behavior run every five minutes by the Matanbuchus 3.0 EventLogBackupTask scheduled task. Adversaries leverage regsvr32 as a signed LOLBin to load a malicious DLL through its DllInstall path while bypassing DllRegisterServer monitoring, making early detection critical for surfacing loader persistence before payload deployment.

Reporting behind it

Related detections9 linkedT1218.010 — drag to rearrange

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Malicious Office Application Loading a User-Path DLL via Regsvr32 or Rundll32 (via process_creation)

Masquerading SSLoad PhantomLoader DLL Execution via Regsvr32 Silent Load from AppData (via process_creation)

Malicious Kimsuky AlphaSeed Payload Execution via Regsvr32 Loading edge dat (via process_creation)

Malicious Regsvr32 Executing DLL From Windows Temp

HttpSpy Payload Registration via Regsvr32 of Non-DLL File (via process_creation)

Malicious regsvr32 Scriptlet Execution via scrobj.dll

Malicious Matanbuchus Persistence via regsvr32 Silent Install with User Context (via process_creation)

Pivot detection · T1218.010 · 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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