Hidden Files and Directories — Sigma Rule

Rule metadata and linked tags

Author: Pawel Mazur. Source status: test; severity: low. Source dates: 2021-09-06 / 2025-06-16.

{
  "product": "linux",
  "service": "auditd"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 98e9c83ba23ee97df42a3069479b687b5e011a7bccf8ff758093b3ebb91885b2

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Hidden Files and Directories
id: d08722cd-3d09-449a-80b4-83ea2d9d4616
status: test
description: Detects adversary creating hidden file or directory, by detecting directories or files with . as the first character
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1564.001/T1564.001.md
author: 'Pawel Mazur'
date: 2021-09-06
modified: 2025-06-16
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

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1564.001/T1564.001.md