Malicious LSASS Memory Dump via rundll32 comsvcs MiniDump

ATT&CK techniques

Cred Access

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

What it detects

This rule detects rundll32 invoking the comsvcs MiniDump export to dump process memory which was used against LSASS in the SystemBC intrusion described by WithSecure as a prelude to ransomware. Dumping LSASS with the built in comsvcs helper is a widely abused living off the land credential access technique that yields domain credentials for lateral movement.

Reporting behind it

Related detections9 linkedT1003.001 — drag to rearrange

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Malicious Mimikatz Credential Dumping via Command Line Arguments

Malicious Credential Extraction via Volatility Memory Analysis (via process_creation)

Suspicious Physical Memory Acquisition via WinPmem (via process_creation)

Malicious LSASS Credential Dump via Rundll32 Comsvcs MiniDump via Process Creation (via process_creation)

Suspicious LSASS Credential Access via PowerShell (via process_creation)

Suspicious LSASS Memory Dump via Task Manager After Ivanti Exploitation

Malicious LSASS Memory Dump via rundll32 comsvcs MiniDump

Pivot detection · T1003.001 · 9 related

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