{"id":"41d1058a-aea7-4952-9293-29eaaf516465","title":"Removal Of AMSI Provider Registry Keys","description":"Detects the deletion of AMSI provider registry key entries in HKLM\\Software\\Microsoft\\AMSI. This technique could be used by an attacker in order to disable AMSI inspection.","author":"frack113","status":"test","level":"high","date":"2021-06-07","modified":"2025-10-07","tags":["attack.defense-impairment","attack.t1685"],"technique_ids":["T1685"],"logsource":{"product":"windows","category":"registry_delete"},"falsepositives":["Unlikely"],"references":["https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.001/T1562.001.md","https://seclists.org/fulldisclosure/2020/Mar/45"],"source_path":"rules/windows/registry/registry_delete/registry_delete_removal_amsi_registry_key.yml","source_sha256":"42cf7a4f735ed648430229569e2fdc3df9401c8401ef9a3de9b0665617f08eb5","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/registry/registry_delete/registry_delete_removal_amsi_registry_key.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Removal Of AMSI Provider Registry Keys\nid: 41d1058a-aea7-4952-9293-29eaaf516465\nstatus: test\ndescription: Detects the deletion of AMSI provider registry key entries in HKLM\\Software\\Microsoft\\AMSI. This technique could be used by an attacker in order to disable AMSI inspection.\nreferences:\n    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.001/T1562.001.md\n    - https://seclists.org/fulldisclosure/2020/Mar/45\nauthor: frack113\ndate: 2021-06-07\nmodified: 2025-10-07\ntags:\n    - attack.defense-impairment\n    - attack.t1685\nlogsource:\n    product: windows\n    category: registry_delete\ndetection:\n    selection:\n        TargetObject|endswith:\n            - '{2781761E-28E0-4109-99FE-B9D127C57AFE}' # IOfficeAntiVirus\n            - '{A7C452EF-8E9F-42EB-9F2B-245613CA0DC9}' # ProtectionManagement.dll\n    filter_main_defender:\n        Image|startswith:\n            - 'C:\\ProgramData\\Microsoft\\Windows Defender\\Platform\\'\n            - 'C:\\Program Files\\Windows Defender\\'\n            - 'C:\\Program Files (x86)\\Windows Defender\\'\n        Image|endswith: '\\MsMpEng.exe'\n    condition: selection and not 1 of filter_main_*\nfalsepositives:\n    - Unlikely\nlevel: high\nregression_tests_path: regression_data/rules/windows/registry/registry_delete/registry_delete_removal_amsi_registry_key/info.yml\nsimulation:\n    - type: atomic-red-team\n      name: AMSI Bypass - Remove AMSI Provider Reg Key\n      technique: T1562.001\n      atomic_guid: 13f09b91-c953-438e-845b-b585e51cac9b\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1685","id":"T1685","name":"Disable or Modify Tools","page":"techniques/enterprise/T1685/"}],"data_path":"data/detection-rules/41d1058a-aea7-4952-9293-29eaaf516465.json","kind":"sigma"}