File With Suspicious Extension Downloaded Via Bitsadmin

calendar Aug 12, 2024 · attack.defense-evasion attack.persistence attack.t1197 attack.s0190 attack.t1036.003  ·
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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
18logsource:
19    category: process_creation
20    product: windows
21detection:
22    selection_img:
23        - Image|endswith: '\bitsadmin.exe'
24        - OriginalFileName: 'bitsadmin.exe'
25    selection_flags:
26        CommandLine|contains:
27            - ' /transfer '
28            - ' /create '
29            - ' /addfile '
30    selection_extension:
31        CommandLine|contains:
32            - '.7z'
33            - '.asax'
34            - '.ashx'
35            - '.asmx'
36            - '.asp'
37            - '.aspx'
38            - '.bat'
39            - '.cfm'
40            - '.cgi'
41            - '.chm'
42            - '.cmd'
43            - '.dll'
44            - '.gif'
45            - '.jpeg'
46            - '.jpg'
47            - '.jsp'
48            - '.jspx'
49            - '.log'
50            - '.png'
51            - '.ps1'
52            - '.psm1'
53            - '.rar'
54            - '.scf'
55            - '.sct'
56            - '.txt'
57            - '.vbe'
58            - '.vbs'
59            - '.war'
60            - '.wsf'
61            - '.wsh'
62            - '.xll'
63            - '.zip'
64    condition: all of selection_*
65falsepositives:
66    - Unknown
67level: high

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