BITS Transfer Job With Uncommon Or Suspicious Remote TLD

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.

Sigma rule (View on GitHub)

 1title: BITS Transfer Job With Uncommon Or Suspicious Remote TLD
 2id: 6d44fb93-e7d2-475c-9d3d-54c9c1e33427
 3status: test
 4description: 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.
 5references:
 6    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1197/T1197.md
 7    - https://twitter.com/malmoeb/status/1535142803075960832
 8author: Florian Roth (Nextron Systems)
 9date: 2022/06/10
10modified: 2023/03/27
11tags:
12    - attack.defense_evasion
13    - attack.persistence
14    - attack.t1197
15logsource:
16    product: windows
17    service: bits-client
18detection:
19    selection:
20        EventID: 16403
21    filter_main_generic:
22        RemoteName|contains:
23            - '.azureedge.net/'
24            - '.com/'
25            - '.sfx.ms/'
26            - 'download.mozilla.org/' # https://download.mozilla.org/?product=firefox-101.0.1-partial-101.0&os=win64&lang=en-US
27    condition: selection and not 1 of filter_main_*
28falsepositives:
29    - 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
30level: medium

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