Sigma rule: Credential Dumping Attempt Via WerFault

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-556b37d359d6, updated 2023-11-29T00:00:00.000Z.

Rule

Title
Credential Dumping Attempt Via WerFault
Status
test
Level
high
Author
Florian Roth (Nextron Systems)
Date
2022-06-27
Modified
2023-11-29
File
rules/windows/process_access/proc_access_win_lsass_werfault.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects process LSASS memory dump using Mimikatz, NanoDump, Invoke-Mimikatz, Procdump or Taskmgr based on the CallTrace pointing to ntdll.dll, dbghelp.dll or dbgcore.dll for win10, server2016 and up.

Log source

product
windows
category
process_access

Detection

selection:
    SourceImage|endswith: '\WerFault.exe'
    TargetImage|endswith: '\lsass.exe'
    GrantedAccess: '0x1FFFFF'
condition: selection

False positives (as the rule lists them)

  • Actual failures in lsass.exe that trigger a crash dump (unlikely)
  • Unknown cases in which WerFault accesses lsass.exe

Tags

  • attack.credential-access
  • attack.t1003.001
  • attack.s0002

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_werfault.yml

Sources and licences

  • SigmaHQ

    "Credential Dumping Attempt Via WerFault" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_access/proc_access_win_lsass_werfault.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: Credential Dumping Attempt Via WerFault",
entity page, dataset version ref-556b37d359d6, updated 2023-11-29T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/e5b33f7d-eb93-48b6-9851-09e1e610b6d7 (accessed 2026-11-03).
Underlying source: SigmaHQ rule e5b33f7d-eb93-48b6-9851-09e1e610b6d7, 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.