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
 9modified: 2024-04-29
10tags:
11    - attack.defense-evasion
12    - attack.t1564.001
13logsource:
14    category: process_creation
15    product: windows
16detection:
17    selection_icacls:
18        - OriginalFileName: 'iCACLS.EXE'
19        - Image|endswith: '\icacls.exe'
20    selection_cmd: # icacls "C:\Users\admin\AppData\Local\37f92fe8-bcf0-4ee0-b8ba-561f797f5696" /deny *S-1-1-0:(OI)(CI)(DE,DC)
21        CommandLine|contains|all:
22            - '/deny'
23            - '*S-1-1-0:'
24    condition: all of selection_*
25falsepositives:
26    - Unknown
27level: medium

References

• Analysis File.exe (MD5: 659AC9C3F3C0FFFB292704CB5E7DD699) Malicious activity - Interactive analysis ANY.RUN

  

  Interactive malware hunting service. Live testing of most type of threats in any environments. No installation and no waiting necessary.

  
  Read More

Related rules

• Displaying Hidden Files Feature Disabled
• Hidden Files and Directories
• Hiding Files with Attrib.exe
• PowerShell Logging Disabled Via Registry Key Tampering
• Registry Persistence via Service in Safe Mode