Suspicious COM Hijack Via InprocServer32 Modification

ATT&CK techniques

Persistence → Priv Esc

Recon
Resource Dev
Initial Access
Execution
Persistence
- T1546.015Component Object Model Hijacking
Priv Esc
- T1546.015Component Object Model Hijacking
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects modification of a CLSID InprocServer32 registry value that points to a DLL in a user-writable directory. UAT-5647 hijacked COM objects by rewriting InprocServer32 CLSID keys to load RomCom components for persistence. Redirecting an InprocServer32 default value to an attacker DLL causes trusted applications to load malicious code providing stealthy persistence and execution.

Reporting behind it

Related detections9 linkedT1546.015 — drag to rearrange

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Malicious COM Hijack of PSFactoryBuffer InprocServer32

Malicious APT-C-60 COM Hijack via SpyGlace CLSID InProcServer32 (via registry_set)

Malicious COM Hijack via CLSID InProcServer32 Registry Modification (via registry_set)

Malicious COM Object Hijack Pointing to a User-Writable DLL (via registry_set)

Malicious COM Object Hijack Pointing to IconCache DLL

Suspicious COM Hijack via CLSID InprocServer32 Pointing to Writable Path (via registry_set)

Suspicious COM Hijack Via InprocServer32 Modification

Pivot detection · T1546.015 · 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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