title: File or Folder Permissions Modifications
author: Jakob Weinzettl, oscd.community
date: 2019/10/23
description: Detects a file or folder's permissions being modified.
detection:
    SELECTION_1:
        EventID: 1
    SELECTION_2:
        Image: '*\takeown.exe'
    SELECTION_3:
        Image: '*\cacls.exe'
    SELECTION_4:
        Image: '*\icacls.exe'
    SELECTION_5:
        CommandLine: '*/grant*'
    SELECTION_6:
        Image: '*\attrib.exe'
    SELECTION_7:
        CommandLine: '*-r*'
    condition: (SELECTION_1 and (((SELECTION_2 or SELECTION_3 or SELECTION_4) and
        SELECTION_5) or (SELECTION_6 and SELECTION_7)))
falsepositives:
- Users interacting with the files on their own (unlikely unless privileged users).
fields:
- ComputerName
- User
- CommandLine
id: 37ae075c-271b-459b-8d7b-55ad5f993dd8
level: medium
logsource:
    category: process_creation
    product: windows
modified: 2019/11/08
references:
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1222.001/T1222.001.md
status: experimental
tags:
- attack.defense_evasion
- attack.t1222.001
- attack.t1222
yml_filename: win_file_permission_modifications.yml
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation