Detectionmediumtest

IIS Native-Code Module Command Line Installation

Detects suspicious IIS native-code module installations via command line

Convert In Phoenix Studio

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

Launch

Florian Roth (Nextron Systems)Created Wed Dec 11Updated Wed Mar 139465ddf4-f9e4-4ebd-8d98-702df3a93239windows

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: '\appcmd.exe'
        - OriginalFileName: 'appcmd.exe'
    selection_cli:
        CommandLine|contains|all:
            - 'install'
            - 'module'
        CommandLine|contains|windash: '-name:'
    filter_iis_setup:
        ParentImage: 'C:\Windows\System32\inetsrv\iissetup.exe'
    condition: all of selection_* and not 1 of filter_*