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.defense_evasion
12    - attack.t1574.002
13logsource:
14    product: windows
15    service: security-mitigations
16detection:
17    selection:
18        EventID:
19            - 11
20            - 12 # MDE: ExploitGuardNonMicrosoftSignedBlocked
21        ProcessPath|endswith:
22            - '\MpCmdRun.exe'
23            - '\NisSrv.exe'
24    condition: selection
25falsepositives:
26    - Unknown
27level: high