Use Icacls to Hide File to Everyone

 1title: Use Icacls to Hide File to Everyone
 2id: 4ae81040-fc1c-4249-bfa3-938d260214d9
 3status: test
 4description: Detect use of icacls to deny access for everyone in Users folder sometimes used to hide malicious files
 5references:
 6    - https://app.any.run/tasks/1df999e6-1cb8-45e3-8b61-499d1b7d5a9b/
 7author: frack113
 8date: 2022/07/18
 9tags:
10    - attack.defense_evasion
11    - attack.t1564.001
12logsource:
13    category: process_creation
14    product: windows
15detection:
16    selection_icacls:
17        - OriginalFileName: 'iCACLS.EXE'
18        - Image|endswith: '\icacls.exe'
19    selection_cmd: # icacls "C:\Users\admin\AppData\Local\37f92fe8-bcf0-4ee0-b8ba-561f797f5696" /deny *S-1-1-0:(OI)(CI)(DE,DC)
20        CommandLine|contains|all:
21            - 'C:\Users\'
22            - '/deny'
23            - '*S-1-1-0:'
24    condition: all of selection*
25falsepositives:
26    - Legitimate use
27level: medium