SigmaHQ/rules/windows/sysmon/sysmon_attrib_hiding_files.yml

title: Hiding files with attrib.exe
status: experimental
description: Detects usage of attrib.exe to hide files from users.
author: Sami Ruohonen
logsource:
    product: windows
    service: sysmon
detection:
    selection:
        EventID: 1
        Image: '*\attrib.exe'
        CommandLine: '* +h *'
    ini:
        CommandLine: '*\desktop.ini *'
    intel:
        ParentImage: '*\cmd.exe'
        CommandLine: '+R +H +S +A *.cui'
        ParentCommandLine: 'C:\WINDOWS\system32\*.bat'
    condition: selection and not (ini or intel)
fields:
    - CommandLine
    - ParentCommandLine
    - User
tags:
    - attack.defense_evasion
    - attack.persistence
    - attack.t1158
falsepositives:
    - igfxCUIService.exe hiding *.cui files via .bat script (attrib.exe a child of cmd.exe and igfxCUIService.exe is the parent of the cmd.exe)
    - msiexec.exe hiding desktop.ini
level: low