{"id":"b85e5894-9b19-4d86-8c87-a2f3b81f0521","title":"BITS Transfer Job Downloading File Potential Suspicious Extension","description":"Detects new BITS transfer job saving local files with potential suspicious extensions","author":"frack113","status":"test","level":"medium","date":"2022-03-01","modified":"2023-03-27","tags":["attack.persistence","attack.execution","attack.stealth","attack.t1197"],"technique_ids":["T1197"],"logsource":{"product":"windows","service":"bits-client"},"falsepositives":["While the file extensions in question can be suspicious at times. It's best to add filters according to your environment to avoid large amount false positives"],"references":["https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1197/T1197.md"],"source_path":"rules/windows/builtin/bits_client/win_bits_client_new_transfer_saving_susp_extensions.yml","source_sha256":"36b40d167562b06a06814cd180a78dbe8b6532df4dbc3441dcf3e9882c642099","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/builtin/bits_client/win_bits_client_new_transfer_saving_susp_extensions.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: BITS Transfer Job Downloading File Potential Suspicious Extension\nid: b85e5894-9b19-4d86-8c87-a2f3b81f0521\nstatus: test\ndescription: Detects new BITS transfer job saving local files with potential suspicious extensions\nreferences:\n    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1197/T1197.md\nauthor: frack113\ndate: 2022-03-01\nmodified: 2023-03-27\ntags:\n    - attack.persistence\n    - attack.execution\n    - attack.stealth\n    - attack.t1197\nlogsource:\n    product: windows\n    service: bits-client\ndetection:\n    selection:\n        EventID: 16403\n        LocalName|endswith:\n            # TODO: Extend this list with more interesting file extensions\n            - '.bat'\n            - '.dll'\n            - '.exe' # TODO: Might wanna comment this if it generates tons of FPs\n            - '.hta'\n            - '.ps1'\n            - '.psd1'\n            - '.sh'\n            - '.vbe'\n            - '.vbs'\n    filter_optional_generic:\n        # Typical updates: Chrome, Dropbox etc.\n        LocalName|contains: '\\AppData\\'\n        RemoteName|contains: '.com'\n    condition: selection and not 1 of filter_optional_*\nfalsepositives:\n    - While the file extensions in question can be suspicious at times. It's best to add filters according to your environment to avoid large amount false positives\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1197","id":"T1197","name":"BITS Jobs","page":"techniques/enterprise/T1197/"}],"data_path":"data/detection-rules/b85e5894-9b19-4d86-8c87-a2f3b81f0521.json","kind":"sigma"}