Microsoft Defender Blocked from Loading Unsigned DLL

 1title: Microsoft Defender Blocked from Loading Unsigned DLL
 2id: 0b0ea3cc-99c8-4730-9c53-45deee2a4c86
 3status: test
 4description: Detects Code Integrity (CI) engine blocking Microsoft Defender's processes (MpCmdRun and NisSrv) from loading unsigned DLLs which may be an attempt to sideload arbitrary DLL
 5references:
 6    - https://www.sentinelone.com/blog/living-off-windows-defender-lockbit-ransomware-sideloads-cobalt-strike-through-microsoft-security-tool
 7author: Bhabesh Raj
 8date: 2022-08-02
 9modified: 2022-09-28
10tags:
11    - attack.privilege-escalation
12    - attack.persistence
13    - attack.execution
14    - attack.stealth
15    - attack.t1574.001
16logsource:
17    product: windows
18    service: security-mitigations
19detection:
20    selection:
21        EventID:
22            - 11
23            - 12 # MDE: ExploitGuardNonMicrosoftSignedBlocked
24        ProcessPath|endswith:
25            - '\MpCmdRun.exe'
26            - '\NisSrv.exe'
27    condition: selection
28falsepositives:
29    - Unknown
30level: high