Detectionmediumtest

New Firewall Rule Added Via Netsh.EXE

Detects the addition of a new rule to the Windows firewall via netsh

Convert In Phoenix Studio

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

Launch

Markus Neis, Sander WiebingCreated Tue Jan 29Updated Fri Feb 10cd5cfd80-aa5f-44c0-9c20-108c4ae12e3cwindows

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: '\netsh.exe'
        - OriginalFileName: 'netsh.exe'
    selection_cli:
        CommandLine|contains|all:
            - ' firewall '
            - ' add '
    filter_optional_dropbox:
        CommandLine|contains:
            - 'advfirewall firewall add rule name=Dropbox dir=in action=allow "program=?:\Program Files (x86)\Dropbox\Client\Dropbox.exe" enable=yes profile=Any'
            - 'advfirewall firewall add rule name=Dropbox dir=in action=allow "program=?:\Program Files\Dropbox\Client\Dropbox.exe" enable=yes profile=Any'
    condition: all of selection_* and not 1 of filter_optional_*