Detectionmediumtest

Whoami.EXE Execution With Output Option

Detects the execution of "whoami.exe" with the "/FO" flag to choose CSV as output format or with redirection options to export the results to a file for later use.

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), Nasreddine Bencherchali (Nextron Systems)Created Tue Feb 28Updated Mon Dec 04c30fb093-1109-4dc8-88a8-b30d11c95a5dwindows

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_main_img:
        - Image|endswith: '\whoami.exe'
        - OriginalFileName: 'whoami.exe'
    selection_main_cli:
        CommandLine|contains:
            - ' /FO CSV'
            - ' -FO CSV'
    selection_special:
        CommandLine|contains: 'whoami*>'
    condition: all of selection_main_* or selection_special