Possible Hidden Files and Directories (via auditd)

title: Possible Hidden Files and Directories (via auditd)
id: df27934a-aeb0-5ccf-a9cd-22b14c9d2b93
status: stable
description: This rule detects adversary creating hidden file or directory, by detecting directories or files with . as the first character
references:
    - https://attack.mitre.org/techniques/T1564/001/
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1564.001/T1564.001.md
author: 'Huntrule Team'
date: 2026-06-05
tags:
    - attack.stealth
    - attack.t1564.001
logsource:
    product: linux
    service: auditd
detection:
    selection_commands:
        type: 'EXECVE'
        a0:
            - 'mkdir'
            - 'nano'
            - 'touch'
            - 'vi'
            - 'vim'
    selection_arguments:
        - a1|re: '(^|\/)\.[^.\/]'
        - a2|re: '(^|\/)\.[^.\/]'
    condition: all of selection_*
falsepositives:
    - Unknown
level: low