{"id":"6d44fb93-e7d2-475c-9d3d-54c9c1e33427","title":"BITS Transfer Job With Uncommon Or Suspicious Remote TLD","description":"Detects a suspicious download using the BITS client from a FQDN that is unusual. Adversaries may abuse BITS jobs to persistently execute or clean up after malicious payloads.","author":"Florian Roth (Nextron Systems)","status":"test","level":"medium","date":"2022-06-10","modified":"2025-02-28","tags":["attack.persistence","attack.execution","attack.stealth","attack.t1197"],"technique_ids":["T1197"],"logsource":{"product":"windows","service":"bits-client"},"falsepositives":["This rule doesn't exclude other known TLDs such as \".org\" or \".net\". It's recommended to apply additional filters for software and scripts that leverage the BITS service"],"references":["https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1197/T1197.md","https://twitter.com/malmoeb/status/1535142803075960832"],"source_path":"rules/windows/builtin/bits_client/win_bits_client_new_transfer_via_uncommon_tld.yml","source_sha256":"a99fda620640f78349f6b9bd158fe027567d925572b6670220fc9cac863c08c6","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/builtin/bits_client/win_bits_client_new_transfer_via_uncommon_tld.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 With Uncommon Or Suspicious Remote TLD\nid: 6d44fb93-e7d2-475c-9d3d-54c9c1e33427\nstatus: test\ndescription: Detects a suspicious download using the BITS client from a FQDN that is unusual. Adversaries may abuse BITS jobs to persistently execute or clean up after malicious payloads.\nreferences:\n    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1197/T1197.md\n    - https://twitter.com/malmoeb/status/1535142803075960832\nauthor: Florian Roth (Nextron Systems)\ndate: 2022-06-10\nmodified: 2025-02-28\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    filter_main_generic:\n        RemoteName|contains:\n            - '.azureedge.net/'\n            - '.com/'\n            - '.sfx.ms/'\n            - 'download.mozilla.org/' # https://download.mozilla.org/?product=firefox-101.0.1-partial-101.0&os=win64&lang=en-US\n            - 'cdn.onenote.net/'\n            - 'cdn.office.net/'\n            - 'tscdn.m365.static.microsoft/'\n    condition: selection and not 1 of filter_main_*\nfalsepositives:\n    - This rule doesn't exclude other known TLDs such as \".org\" or \".net\". It's recommended to apply additional filters for software and scripts that leverage the BITS service\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/6d44fb93-e7d2-475c-9d3d-54c9c1e33427.json","kind":"sigma"}