Sigma rule: Potential Persistence Via LSA Extensions

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-40e83c404f5a, updated 2023-08-17T00:00:00.000Z.

Rule

Title
Potential Persistence Via LSA Extensions
Status
test
Level
high
Author
Nasreddine Bencherchali (Nextron Systems)
Date
2022-07-21
Modified
2023-08-17
File
rules/windows/registry/registry_set/registry_set_persistence_lsa_extension.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects when an attacker modifies the "REG_MULTI_SZ" value named "Extensions" to include a custom DLL to achieve persistence via lsass.
The "Extensions" list contains filenames of DLLs being automatically loaded by lsass.exe. Each DLL has its InitializeLsaExtension() method called after loading.

Log source

product
windows
category
registry_set

Detection

selection:
    TargetObject|contains: '\SYSTEM\CurrentControlSet\Control\LsaExtensionConfig\LsaSrv\Extensions'
condition: selection

False positives (as the rule lists them)

  • Unlikely

Tags

  • attack.persistence

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/registry/registry_set/registry_set_persistence_lsa_extension.yml

Sources and licences

  • SigmaHQ

    "Potential Persistence Via LSA Extensions" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_set/registry_set_persistence_lsa_extension.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: Potential Persistence Via LSA Extensions",
entity page, dataset version ref-40e83c404f5a, updated 2023-08-17T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/41f6531d-af6e-4c6e-918f-b946f2b85a36 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 41f6531d-af6e-4c6e-918f-b946f2b85a36, 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.