Detectionhightest

File With Suspicious Extension Downloaded Via Bitsadmin

Detects usage of bitsadmin downloading a file with a suspicious extension

Convert In Phoenix Studio

Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)Created Tue Jun 28Updated Tue May 305b80a791-ad9b-4b75-bcc1-ad4e1e89c200windows

Log Source

WindowsProcess Creation

ProductWindows← raw: windows

CategoryProcess Creation← raw: process_creation

Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.

Detection Logic

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_*