Detectionhighexperimental

Winrs Local Command Execution

Detects the execution of Winrs.exe where it is used to execute commands locally. Commands executed this way are launched under Winrshost.exe and can represent proxy execution used for defense evasion or lateral movement.

Convert In Phoenix Studio

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

Launch

Liran Ravich, Nasreddine Bencherchali (Nextron Systems)Created Wed Oct 22bcfece3d-56fe-4545-9931-3b8e92927db1windows

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:
        # Note: Example of command to simulate (winrm needs to be enabled): "c:\Windows\System32\winrs.exe" calc.exe
        - Image|endswith: '\winrs.exe'
        - OriginalFileName: 'winrs.exe'
    selection_local_ip:
        CommandLine|contains|windash:
            - '/r:localhost'
            - '/r:127.0.0.1'
            - '/r:[::1]'
            - '/remote:localhost'
            - '/remote:127.0.0.1'
            - '/remote:[::1]'
    filter_main_remote:
        CommandLine|contains|windash:
            - "/r:"
            - "/remote:"
    condition: all of selection_* or (selection_img and not 1 of filter_main_*)