{"id":"8b9606c9-28be-4a38-b146-0e313cc232c1","title":"Potential Ransomware Activity Using LegalNotice Message","description":"Detect changes to the \"LegalNoticeCaption\" or \"LegalNoticeText\" registry values where the message set contains keywords often used in ransomware ransom messages","author":"frack113","status":"test","level":"high","date":"2022-12-11","modified":"2023-08-17","tags":["attack.impact","attack.t1491.001"],"technique_ids":["T1491.001"],"logsource":{"product":"windows","category":"registry_set"},"falsepositives":["Unknown"],"references":["https://github.com/redcanaryco/atomic-red-team/blob/5c1e6f1b4fafd01c8d1ece85f510160fc1275fbf/atomics/T1491.001/T1491.001.md"],"source_path":"rules/windows/registry/registry_set/registry_set_legalnotice_susp_message.yml","source_sha256":"f75ea7cd412310a6421999a34b5278dfb3e1974adb6f49b05380fe7fc825364a","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/registry/registry_set/registry_set_legalnotice_susp_message.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Potential Ransomware Activity Using LegalNotice Message\nid: 8b9606c9-28be-4a38-b146-0e313cc232c1\nstatus: test\ndescription: Detect changes to the \"LegalNoticeCaption\" or \"LegalNoticeText\" registry values where the message set contains keywords often used in ransomware ransom messages\nreferences:\n    - https://github.com/redcanaryco/atomic-red-team/blob/5c1e6f1b4fafd01c8d1ece85f510160fc1275fbf/atomics/T1491.001/T1491.001.md\nauthor: frack113\ndate: 2022-12-11\nmodified: 2023-08-17\ntags:\n    - attack.impact\n    - attack.t1491.001\nlogsource:\n    product: windows\n    category: registry_set\ndetection:\n    selection:\n        TargetObject|contains:\n            - '\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System\\LegalNoticeCaption'\n            - '\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Policies\\System\\LegalNoticeText'\n        Details|contains:\n            - 'encrypted'\n            - 'Unlock-Password'\n            - 'paying'\n    condition: selection\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1491.001","id":"T1491.001","name":"Internal Defacement","page":"techniques/enterprise/T1491.001/"}],"data_path":"data/detection-rules/8b9606c9-28be-4a38-b146-0e313cc232c1.json","kind":"sigma"}