Sigma rule: LSASS Access From Potentially White-Listed Processes

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-20f6004193fa, updated 2023-11-29T00:00:00.000Z.

Rule

Title
LSASS Access From Potentially White-Listed Processes
Status
test
Level
high
Author
Florian Roth (Nextron Systems)
Date
2022-02-10
Modified
2023-11-29
File
rules/windows/process_access/proc_access_win_lsass_whitelisted_process_names.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects a possible process memory dump that uses a white-listed filename like TrolleyExpress.exe as a way to dump the LSASS process memory without Microsoft Defender interference

Log source

product
windows
category
process_access

Detection

selection:
    TargetImage|endswith: '\lsass.exe'
    SourceImage|endswith:
        - '\TrolleyExpress.exe'  # Citrix
        - '\ProcessDump.exe'     # Cisco Jabber
        - '\dump64.exe'          # Visual Studio
    GrantedAccess|endswith:
        - '10'
        - '30'
        - '50'
        - '70'
        - '90'
        - 'B0'
        - 'D0'
        - 'F0'
        - '18'
        - '38'
        - '58'
        - '78'
        - '98'
        - 'B8'
        - 'D8'
        - 'F8'
        - '1A'
        - '3A'
        - '5A'
        - '7A'
        - '9A'
        - 'BA'
        - 'DA'
        - 'FA'
        - '0x14C2'  # https://github.com/b4rtik/ATPMiniDump/blob/76304f93b390af3bb66e4f451ca16562a479bdc9/ATPMiniDump/ATPMiniDump.c
        - 'FF'
condition: selection

False positives (as the rule lists them)

  • Unknown

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_whitelisted_process_names.yml

Sources and licences

  • SigmaHQ

    "LSASS Access From Potentially White-Listed Processes" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_access/proc_access_win_lsass_whitelisted_process_names.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 Access From Potentially White-Listed Processes",
entity page, dataset version ref-20f6004193fa, updated 2023-11-29T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/4be8b654-0c01-4c9d-a10c-6b28467fc651 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 4be8b654-0c01-4c9d-a10c-6b28467fc651, 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.