Detectionmediumtest

AWL Bypass with Winrm.vbs and Malicious WsmPty.xsl/WsmTxt.xsl

Detects execution of attacker-controlled WsmPty.xsl or WsmTxt.xsl via winrm.vbs and copied cscript.exe (can be renamed)

Convert In Phoenix Studio

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

Launch

Julia Fomina, oscd.communityCreated Tue Oct 06Updated Sun Oct 09074e0ded-6ced-4ebd-8b4d-53f55908119dwindows

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:
    contains_format_pretty_arg:
        CommandLine|contains:
            - 'format:pretty'
            - 'format:"pretty"'
            - 'format:"text"'
            - 'format:text'
    image_from_system_folder:
        Image|startswith:
            - 'C:\Windows\System32\'
            - 'C:\Windows\SysWOW64\'
    contains_winrm:
        CommandLine|contains: 'winrm'
    condition: contains_winrm and (contains_format_pretty_arg and not image_from_system_folder)