Malicious LSASS Credential Dump via rundll32 and comsvcs MiniDump

ATT&CK techniques

Defense Evasion → Cred Access

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1218.011Rundll32
Cred Access
- T1003.001LSASS Memory
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects rundll32 invoking the comsvcs.dll MiniDump export to dump the memory of LSASS, a credential theft technique observed in the 2025 NTLM abuse campaigns. Attackers call comsvcs.dll MiniDump against the LSASS process id to write its memory to disk and later extract secrets. This is a well-established living-off-the-land method for harvesting cached credentials and NTLM hashes.

Reporting behind it

Related detections9 linkedT1003.001 — drag to rearrange

Windows Process Creation: TrolleyExpress.exe Used to Access lsass Memory (PID Parameters)

Windows: NotPetya indicators via wevtutil log clearing, fsutil deletejournal, and rundll32 .dat/.zip.dll execution

Suspicious LSASS Process Enumeration via tasklist Filter

Malicious LSASS Memory Dump via dllhost ProcDump Masquerade (via process_creation)

Malicious LSASS Credential Extraction via Mimikatz sekurlsa

Suspicious Rundll32 Execution Without Arguments

Malicious LSASS Memory Dump via Comsvcs MiniDump

Malicious rundll32 Execution of BoomBox NativeCache DLL (via process_creation)

Malicious Credential Dumping via Mimikatz Sekurlsa Command (via process_creation)

Malicious LSASS Credential Dump via rundll32 and comsvcs MiniDump

Pivot detection · T1003.001 · 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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