{"id":"9f383dc0-fdeb-4d56-acbc-9f9f4f8f20f3","title":"Unusual File Modification by dns.exe","description":"Detects an unexpected file being modified by dns.exe which my indicate activity related to remote code execution or other forms of exploitation as seen in CVE-2020-1350 (SigRed)","author":"Tim Rauch (Nextron Systems), Elastic (idea)","status":"test","level":"high","date":"2022-09-27","modified":"","tags":["attack.persistence","attack.initial-access","attack.t1133"],"technique_ids":["T1133"],"logsource":{"category":"file_change","product":"windows"},"falsepositives":["Unknown"],"references":["https://www.elastic.co/guide/en/security/current/unusual-file-modification-by-dns-exe.html"],"source_path":"rules/windows/file/file_change/file_change_win_unusual_modification_by_dns_exe.yml","source_sha256":"e1baac31527572b6d0f5fdb5c839ec6713ca39907fa6ec2dbbef61d8ef390849","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/file/file_change/file_change_win_unusual_modification_by_dns_exe.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Unusual File Modification by dns.exe\nid: 9f383dc0-fdeb-4d56-acbc-9f9f4f8f20f3\nrelated:\n    - id: 8f0b1fb1-9bd4-4e74-8cdf-a8de4d2adfd0 # FileDelete version\n      type: similar\nstatus: test\ndescription: Detects an unexpected file being modified by dns.exe which my indicate activity related to remote code execution or other forms of exploitation as seen in CVE-2020-1350 (SigRed)\nreferences:\n    - https://www.elastic.co/guide/en/security/current/unusual-file-modification-by-dns-exe.html\nauthor: Tim Rauch (Nextron Systems), Elastic (idea)\ndate: 2022-09-27\ntags:\n    - attack.persistence\n    - attack.initial-access\n    - attack.t1133\nlogsource:\n    category: file_change\n    product: windows\ndetection:\n    selection:\n        Image|endswith: '\\dns.exe'\n    filter:\n        TargetFilename|endswith: '\\dns.log'\n    condition: selection and not filter\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1133","id":"T1133","name":"External Remote Services","page":"techniques/enterprise/T1133/"}],"data_path":"data/detection-rules/9f383dc0-fdeb-4d56-acbc-9f9f4f8f20f3.json","kind":"sigma"}