{"id":"e9c8808f-4cfb-4ba9-97d4-e5f3beaa244d","title":"Windows Defender Exclusion Registry Key - Write Access Requested","description":"Detects write access requests to the Windows Defender exclusions registry keys. This could be an indication of an attacker trying to request a handle or access the object to write new exclusions in order to bypass security.\n","author":"@BarryShooshooga, Nasreddine Bencherchali (Nextron Systems)","status":"test","level":"medium","date":"2019-10-26","modified":"2023-11-11","tags":["attack.defense-impairment","attack.t1685"],"technique_ids":["T1685"],"logsource":{"product":"windows","service":"security","definition":"Requirements: Audit Policy : Security Settings/Local Policies/Audit Policy, Registry System Access Control (SACL): Auditing/User"},"falsepositives":["Unknown"],"references":["https://www.bleepingcomputer.com/news/security/gootkit-malware-bypasses-windows-defender-by-setting-path-exclusions/"],"source_path":"rules/windows/builtin/security/win_security_windows_defender_exclusions_write_access.yml","source_sha256":"3394f6d4f07eed4dfb1263ddab520164a9f3e1a883be8c7d620042e38a0ec703","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/builtin/security/win_security_windows_defender_exclusions_write_access.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Windows Defender Exclusion Registry Key - Write Access Requested\nid: e9c8808f-4cfb-4ba9-97d4-e5f3beaa244d\nrelated:\n    - id: 46a68649-f218-4f86-aea1-16a759d81820\n      type: derived\n    - id: a33f8808-2812-4373-ae95-8cfb82134978\n      type: derived\nstatus: test\ndescription: |\n    Detects write access requests to the Windows Defender exclusions registry keys. This could be an indication of an attacker trying to request a handle or access the object to write new exclusions in order to bypass security.\nreferences:\n    - https://www.bleepingcomputer.com/news/security/gootkit-malware-bypasses-windows-defender-by-setting-path-exclusions/\nauthor: '@BarryShooshooga, Nasreddine Bencherchali (Nextron Systems)'\ndate: 2019-10-26\nmodified: 2023-11-11\ntags:\n    - attack.defense-impairment\n    - attack.t1685\nlogsource:\n    product: windows\n    service: security\n    definition: 'Requirements: Audit Policy : Security Settings/Local Policies/Audit Policy, Registry System Access Control (SACL): Auditing/User'\ndetection:\n    selection:\n        AccessList|contains:\n            - '%%4417' # WriteData\n            - '%%4418' # AppendData\n        EventID:\n            - 4656 # A handle to an object was requested.\n            - 4663 # An attempt was made to access an object.\n        ObjectName|contains: '\\Microsoft\\Windows Defender\\Exclusions\\'\n    condition: selection\nfalsepositives:\n    - Unknown\nlevel: medium\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/e9c8808f-4cfb-4ba9-97d4-e5f3beaa244d.json","kind":"sigma"}