Malicious LSASS Memory Dump via comsvcs.dll MiniDump
- Product
- windows
- Category
- process_creation
- Author
- HuntRule
- Published
- 2026-09-24
- Updated
- 2026-09-24
ATT&CK techniques
Cred AccessRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects rundll32 invoking the MiniDump export of comsvcs.dll to dump the memory of the LSASS process to disk. This technique was used by the FishMonger group during Operation FishMedley to harvest credentials from compromised hosts. Extracting LSASS memory gives attackers plaintext passwords and hashes for lateral movement and privilege escalation.
Reporting behind it
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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