{"id":"b5de2919-b74a-4805-91a7-5049accbaefe","title":"Download From Suspicious TLD - Whitelist","description":"Detects executable downloads from suspicious remote systems","author":"Florian Roth (Nextron Systems)","status":"test","level":"low","date":"2017-03-13","modified":"2023-05-18","tags":["attack.initial-access","attack.t1566","attack.execution","attack.t1203","attack.t1204.002"],"technique_ids":["T1203","T1204.002","T1566"],"logsource":{"category":"proxy"},"falsepositives":["All kind of software downloads"],"references":["Internal Research"],"source_path":"rules/web/proxy_generic/proxy_download_susp_tlds_whitelist.yml","source_sha256":"e2dec419ead113a47a636578abd563d399e684e37961e855f79c15483ec138e0","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/web/proxy_generic/proxy_download_susp_tlds_whitelist.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Download From Suspicious TLD - Whitelist\nid: b5de2919-b74a-4805-91a7-5049accbaefe\nrelated:\n    - id: 00d0b5ab-1f55-4120-8e83-487c0a7baf19\n      type: similar\nstatus: test\ndescription: Detects executable downloads from suspicious remote systems\nreferences:\n    - Internal Research\nauthor: Florian Roth (Nextron Systems)\ndate: 2017-03-13\nmodified: 2023-05-18\ntags:\n    - attack.initial-access\n    - attack.t1566\n    - attack.execution\n    - attack.t1203\n    - attack.t1204.002\nlogsource:\n    category: proxy\ndetection:\n    selection:\n        c-uri-extension:\n            - 'exe'\n            - 'vbs'\n            - 'bat'\n            - 'rar'\n            - 'ps1'\n            - 'doc'\n            - 'docm'\n            - 'xls'\n            - 'xlsm'\n            - 'pptm'\n            - 'rtf'\n            - 'hta'\n            - 'dll'\n            - 'ws'\n            - 'wsf'\n            - 'sct'\n            - 'zip'\n            # If you want to add more extensions - see https://docs.google.com/spreadsheets/d/1TWS238xacAto-fLKh1n5uTsdijWdCEsGIM0Y0Hvmc5g/\n    filter:\n        cs-host|endswith:\n            - '.com'\n            - '.org'\n            - '.net'\n            - '.edu'\n            - '.gov'\n            - '.uk'\n            - '.ca'\n            - '.de'\n            - '.jp'\n            - '.fr'\n            - '.au'\n            - '.us'\n            - '.ch'\n            - '.it'\n            - '.nl'\n            - '.se'\n            - '.no'\n            - '.es'\n            # Extend this list as needed\n    condition: selection and not filter\nfalsepositives:\n    - All kind of software downloads\nlevel: low\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1203","id":"T1203","name":"Exploitation for Client Execution","page":"techniques/enterprise/T1203/"},{"key":"enterprise/T1204.002","id":"T1204.002","name":"Malicious File","page":"techniques/enterprise/T1204.002/"},{"key":"enterprise/T1566","id":"T1566","name":"Phishing","page":"techniques/enterprise/T1566/"}],"data_path":"data/detection-rules/b5de2919-b74a-4805-91a7-5049accbaefe.json","kind":"sigma"}