SigmaHQ/rules/windows/process_creation/win_file_permission_modifications.yml

title: File or Folder Permissions Modifications
id: 37ae075c-271b-459b-8d7b-55ad5f993dd8
status: experimental
description: Detects a file or folder's permissions being modified.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1222.001/T1222.001.md
author: Jakob Weinzettl, oscd.community
date: 2019/10/23
modified: 2019/11/08
tags:
    - attack.defense_evasion
    - attack.t1222.001
    - attack.t1222  # an old one
logsource:
    category: process_creation
    product: windows
detection:
    selection:
      - Image|endswith: 
          - '\takeown.exe'
          - '\cacls.exe'
          - '\icacls.exe'
        CommandLine|contains: '/grant'
      - Image|endswith: '\attrib.exe'
        CommandLine|contains: '-r'
    condition: selection
fields:
    - ComputerName
    - User
    - CommandLine
falsepositives:
    - Users interacting with the files on their own (unlikely unless privileged users).
level: medium