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.defense-evasion
14    - attack.t1574.001
15logsource:
16    product: windows
17    service: security-mitigations
18detection:
19    selection:
20        EventID:
21            - 11
22            - 12 # MDE: ExploitGuardNonMicrosoftSignedBlocked
23        ProcessPath|endswith:
24            - '\MpCmdRun.exe'
25            - '\NisSrv.exe'
26    condition: selection
27falsepositives:
28    - Unknown
29level: high