{"id":"0b0ea3cc-99c8-4730-9c53-45deee2a4c86","title":"Microsoft Defender Blocked from Loading Unsigned DLL","description":"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","author":"Bhabesh Raj","status":"test","level":"high","date":"2022-08-02","modified":"2022-09-28","tags":["attack.privilege-escalation","attack.persistence","attack.execution","attack.stealth","attack.t1574.001"],"technique_ids":["T1574.001"],"logsource":{"product":"windows","service":"security-mitigations"},"falsepositives":["Unknown"],"references":["https://www.sentinelone.com/blog/living-off-windows-defender-lockbit-ransomware-sideloads-cobalt-strike-through-microsoft-security-tool"],"source_path":"rules/windows/builtin/security_mitigations/win_security_mitigations_defender_load_unsigned_dll.yml","source_sha256":"8d8e33f59ed44ede51161793e1064d0b1c711623eab9b879275ae4f33a662f85","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/builtin/security_mitigations/win_security_mitigations_defender_load_unsigned_dll.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Microsoft Defender Blocked from Loading Unsigned DLL\nid: 0b0ea3cc-99c8-4730-9c53-45deee2a4c86\nstatus: test\ndescription: 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\nreferences:\n    - https://www.sentinelone.com/blog/living-off-windows-defender-lockbit-ransomware-sideloads-cobalt-strike-through-microsoft-security-tool\nauthor: Bhabesh Raj\ndate: 2022-08-02\nmodified: 2022-09-28\ntags:\n    - attack.privilege-escalation\n    - attack.persistence\n    - attack.execution\n    - attack.stealth\n    - attack.t1574.001\nlogsource:\n    product: windows\n    service: security-mitigations\ndetection:\n    selection:\n        EventID:\n            - 11\n            - 12 # MDE: ExploitGuardNonMicrosoftSignedBlocked\n        ProcessPath|endswith:\n            - '\\MpCmdRun.exe'\n            - '\\NisSrv.exe'\n    condition: selection\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1574.001","id":"T1574.001","name":"DLL","page":"techniques/enterprise/T1574.001/"}],"data_path":"data/detection-rules/0b0ea3cc-99c8-4730-9c53-45deee2a4c86.json","kind":"sigma"}