Potential Mpclient.DLL Sideloading

calendar Apr 28, 2026 · attack.privilege-escalation attack.persistence attack.execution attack.stealth attack.t1574.001  ·
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Detects potential sideloading of "mpclient.dll" by Windows Defender processes ("MpCmdRun" and "NisSrv") from their non-default directory.

Sigma rule (View on GitHub)

 1title: Potential Mpclient.DLL Sideloading
 2id: 418dc89a-9808-4b87-b1d7-e5ae0cb6effc
 3related:
 4    - id: 7002aa10-b8d4-47ae-b5ba-51ab07e228b9
 5      type: similar
 6status: test
 7description: Detects potential sideloading of "mpclient.dll" by Windows Defender processes ("MpCmdRun" and "NisSrv") from their non-default directory.
 8references:
 9    - https://www.sentinelone.com/blog/living-off-windows-defender-lockbit-ransomware-sideloads-cobalt-strike-through-microsoft-security-tool
10author: Bhabesh Raj
11date: 2022-08-02
12modified: 2023-08-04
13tags:
14    - attack.privilege-escalation
15    - attack.persistence
16    - attack.execution
17    - attack.stealth
18    - attack.t1574.001
19logsource:
20    product: windows
21    category: image_load
22detection:
23    selection:
24        ImageLoaded|endswith: '\mpclient.dll'
25        Image|endswith:
26            - '\MpCmdRun.exe'
27            - '\NisSrv.exe'
28    filter_main_known_locations:
29        Image|startswith:
30            - 'C:\Program Files (x86)\Windows Defender\'
31            - 'C:\Program Files\Microsoft Security Client\'
32            - 'C:\Program Files\Windows Defender\'
33            - 'C:\ProgramData\Microsoft\Windows Defender\Platform\'
34            - 'C:\Windows\WinSxS\'
35    condition: selection and not 1 of filter_main_*
36falsepositives:
37    - Unlikely
38level: high

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