{"id":"c3cefdf4-6703-4e1c-bad8-bf422fc5015a","title":"Outlook Security Settings Updated - Registry","description":"Detects changes to the registry values related to outlook security settings","author":"frack113","status":"test","level":"medium","date":"2021-12-28","modified":"2026-01-09","tags":["attack.persistence","attack.t1137"],"technique_ids":["T1137"],"logsource":{"category":"registry_set","product":"windows"},"falsepositives":["Administrative activity"],"references":["https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1137/T1137.md","https://learn.microsoft.com/en-us/outlook/troubleshoot/security/information-about-email-security-settings"],"source_path":"rules/windows/registry/registry_set/registry_set_office_outlook_security_settings.yml","source_sha256":"bf93c0c4bdd30bb204824cad4f0101f162241b59a5023e09825898d4e192918d","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/registry/registry_set/registry_set_office_outlook_security_settings.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Outlook Security Settings Updated - Registry\nid: c3cefdf4-6703-4e1c-bad8-bf422fc5015a\nrelated:\n    - id: 6763c6c8-bd01-4687-bc8d-4fa52cf8ba08 # EnableUnsafeClientMailRules\n      type: similar\nstatus: test\ndescription: Detects changes to the registry values related to outlook security settings\nreferences:\n    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1137/T1137.md\n    - https://learn.microsoft.com/en-us/outlook/troubleshoot/security/information-about-email-security-settings\nauthor: frack113\ndate: 2021-12-28\nmodified: 2026-01-09\ntags:\n    - attack.persistence\n    - attack.t1137\nlogsource:\n    category: registry_set\n    product: windows\ndetection:\n    selection:\n        TargetObject|contains|all:\n            - '\\SOFTWARE\\Microsoft\\Office\\'\n            - '\\Outlook\\Security\\'\n    filter_main_outlook:\n        Image|startswith:\n            - 'C:\\Program Files\\Microsoft Office\\'\n            - 'C:\\Program Files (x86)\\Microsoft Office\\'\n        Image|endswith: '\\OUTLOOK.EXE'\n    condition: selection and not 1 of filter_main_*\nfalsepositives:\n    - Administrative activity\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1137","id":"T1137","name":"Office Application Startup","page":"techniques/enterprise/T1137/"}],"data_path":"data/detection-rules/c3cefdf4-6703-4e1c-bad8-bf422fc5015a.json","kind":"sigma"}