Sigma rule: File With Suspicious Extension Downloaded Via Bitsadmin

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-43f9b3003cec, updated 2023-05-30T00:00:00.000Z.

Rule

Title
File With Suspicious Extension Downloaded Via Bitsadmin
Status
test
Level
high
Author
Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
Date
2022-06-28
Modified
2023-05-30
File
rules/windows/process_creation/proc_creation_win_bitsadmin_download_susp_extensions.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects usage of bitsadmin downloading a file with a suspicious extension

Log source

product
windows
category
process_creation

Detection

selection_img:
    - Image|endswith: '\bitsadmin.exe'
    - OriginalFileName: 'bitsadmin.exe'
selection_flags:
    CommandLine|contains:
        - ' /transfer '
        - ' /create '
        - ' /addfile '
selection_extension:
    CommandLine|contains:
        - '.7z'
        - '.asax'
        - '.ashx'
        - '.asmx'
        - '.asp'
        - '.aspx'
        - '.bat'
        - '.cfm'
        - '.cgi'
        - '.chm'
        - '.cmd'
        - '.dll'
        - '.gif'
        - '.jpeg'
        - '.jpg'
        - '.jsp'
        - '.jspx'
        - '.log'
        - '.png'
        - '.ps1'
        - '.psm1'
        - '.rar'
        - '.scf'
        - '.sct'
        - '.txt'
        - '.vbe'
        - '.vbs'
        - '.war'
        - '.wsf'
        - '.wsh'
        - '.xll'
        - '.zip'
condition: all of selection_*

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.persistence
  • attack.execution
  • attack.stealth
  • attack.t1197
  • attack.s0190
  • attack.t1036.003
  • attack.command-and-control
  • attack.t1105

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_bitsadmin_download_susp_extensions.yml

Sources and licences

  • SigmaHQ

    "File With Suspicious Extension Downloaded Via Bitsadmin" by Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_bitsadmin_download_susp_extensions.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: File With Suspicious Extension Downloaded Via Bitsadmin",
entity page, dataset version ref-43f9b3003cec, updated 2023-05-30T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/5b80a791-ad9b-4b75-bcc1-ad4e1e89c200 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 5b80a791-ad9b-4b75-bcc1-ad4e1e89c200, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.