File With Suspicious Extension Downloaded Via Bitsadmin

calendar Jan 29, 2026 · attack.defense-evasion attack.persistence attack.t1197 attack.s0190 attack.t1036.003 attack.command-and-control attack.t1105  ·
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Detects usage of bitsadmin downloading a file with a suspicious extension

Sigma rule (View on GitHub)

 1title: File With Suspicious Extension Downloaded Via Bitsadmin
 2id: 5b80a791-ad9b-4b75-bcc1-ad4e1e89c200
 3status: test
 4description: Detects usage of bitsadmin downloading a file with a suspicious extension
 5references:
 6    - https://blog.netspi.com/15-ways-to-download-a-file/#bitsadmin
 7    - https://isc.sans.edu/diary/22264
 8    - https://lolbas-project.github.io/lolbas/Binaries/Bitsadmin/
 9author: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
10date: 2022-06-28
11modified: 2023-05-30
12tags:
13    - attack.defense-evasion
14    - attack.persistence
15    - attack.t1197
16    - attack.s0190
17    - attack.t1036.003
18    - attack.command-and-control
19    - attack.t1105
20logsource:
21    category: process_creation
22    product: windows
23detection:
24    selection_img:
25        - Image|endswith: '\bitsadmin.exe'
26        - OriginalFileName: 'bitsadmin.exe'
27    selection_flags:
28        CommandLine|contains:
29            - ' /transfer '
30            - ' /create '
31            - ' /addfile '
32    selection_extension:
33        CommandLine|contains:
34            - '.7z'
35            - '.asax'
36            - '.ashx'
37            - '.asmx'
38            - '.asp'
39            - '.aspx'
40            - '.bat'
41            - '.cfm'
42            - '.cgi'
43            - '.chm'
44            - '.cmd'
45            - '.dll'
46            - '.gif'
47            - '.jpeg'
48            - '.jpg'
49            - '.jsp'
50            - '.jspx'
51            - '.log'
52            - '.png'
53            - '.ps1'
54            - '.psm1'
55            - '.rar'
56            - '.scf'
57            - '.sct'
58            - '.txt'
59            - '.vbe'
60            - '.vbs'
61            - '.war'
62            - '.wsf'
63            - '.wsh'
64            - '.xll'
65            - '.zip'
66    condition: all of selection_*
67falsepositives:
68    - Unknown
69level: high
70regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_bitsadmin_download_susp_extensions/info.yml
71simulation:
72    - type: atomic-red-team
73      name: Windows - BITSAdmin BITS Download
74      technique: T1105
75      atomic_guid: a1921cd3-9a2d-47d5-a891-f1d0f2a7a31b

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