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Potential Persistence Via LSA Extensions

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.

Detection Query

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

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2022-07-21

Data Sources

windowsRegistry Set Events

Platforms

windows

References

Tags

attack.persistence

Raw Content

title: Potential Persistence Via LSA Extensions
id: 41f6531d-af6e-4c6e-918f-b946f2b85a36
status: test
description: |
    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.
references:
    - https://persistence-info.github.io/Data/lsaaextension.html
    - https://twitter.com/0gtweet/status/1476286368385019906
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-07-21
modified: 2023-08-17
tags:
    - attack.persistence
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|contains: '\SYSTEM\CurrentControlSet\Control\LsaExtensionConfig\LsaSrv\Extensions'
    condition: selection
falsepositives:
    - Unlikely
level: high