Sigma rule: Lsass Memory Dump via Comsvcs DLL

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-62514bdbe16c, updated 2023-11-29T00:00:00.000Z.

Rule

Title
Lsass Memory Dump via Comsvcs DLL
Status
test
Level
high
Author
Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
Date
2020-10-20
Modified
2023-11-29
File
rules/windows/process_access/proc_access_win_lsass_dump_comsvcs_dll.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects adversaries leveraging the MiniDump export function from comsvcs.dll via rundll32 to perform a memory dump from lsass.

Log source

product
windows
category
process_access

Detection

selection:
    TargetImage|endswith: '\lsass.exe'
    SourceImage|endswith: '\rundll32.exe'
    CallTrace|contains: 'comsvcs.dll'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.credential-access
  • attack.t1003.001

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_access/proc_access_win_lsass_dump_comsvcs_dll.yml

Sources and licences

  • SigmaHQ

    "Lsass Memory Dump via Comsvcs DLL" by Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_access/proc_access_win_lsass_dump_comsvcs_dll.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Lsass Memory Dump via Comsvcs DLL",
entity page, dataset version ref-62514bdbe16c, updated 2023-11-29T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/a49fa4d5-11db-418c-8473-1e014a8dd462 (accessed 2026-11-03).
Underlying source: SigmaHQ rule a49fa4d5-11db-418c-8473-1e014a8dd462, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.