Possible Steganography Hide Zip Information in Picture File (via auditd)

title: Possible Steganography Hide Zip Information in Picture File (via auditd)
id: 82b70feb-d084-56e6-8217-a4e44f371667
status: stable
description: This rule detects appending of zip file to image
references:
    - https://attack.mitre.org/techniques/T1027/003/
    - https://zerotoroot.me/steganography-hiding-a-zip-in-a-jpeg-file/
author: 'Huntrule Team'
date: 2026-02-06
tags:
    - attack.stealth
    - attack.t1027.003
logsource:
    product: linux
    service: auditd
detection:
    commands:
        type: EXECVE
        a0: cat
    a1:
        a1|endswith:
            - '.jpg'
            - '.png'
    a2:
        a2|endswith: '.zip'
    condition: commands and a1 and a2
falsepositives:
    - Unknown
level: low