Sigma rule: Unsigned Image Loaded Into LSASS Process

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-624a6027f313, updated 2021-11-27T00:00:00.000Z.

Rule

Title
Unsigned Image Loaded Into LSASS Process
Status
test
Level
medium
Author
Teymur Kheirkhabarov, oscd.community
Date
2019-10-22
Modified
2021-11-27
File
rules/windows/image_load/image_load_lsass_unsigned_image_load.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Loading unsigned image (DLL, EXE) into LSASS process

Log source

product
windows
category
image_load

Detection

selection:
    Image|endswith: '\lsass.exe'
    Signed: 'false'
condition: selection

False positives (as the rule lists them)

  • Valid user connecting using RDP

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/image_load/image_load_lsass_unsigned_image_load.yml

Sources and licences

  • SigmaHQ

    "Unsigned Image Loaded Into LSASS Process" by Teymur Kheirkhabarov, oscd.community (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/image_load/image_load_lsass_unsigned_image_load.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: Unsigned Image Loaded Into LSASS Process",
entity page, dataset version ref-624a6027f313, updated 2021-11-27T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/857c8db3-c89b-42fb-882b-f681c7cf4da2 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 857c8db3-c89b-42fb-882b-f681c7cf4da2, 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.