Detection rules › Sigma
Steganography Hide Zip Information in Picture File
Detects appending of zip file to image
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth | T1027.003 Obfuscated Files or Information: Steganography |
Event coverage
| Provider | Event |
|---|---|
| Linux-Auditd | Event ID 1309 |
Rule body yaml
title: Steganography Hide Zip Information in Picture File
id: 45810b50-7edc-42ca-813b-bdac02fb946b
status: test
description: Detects appending of zip file to image
references:
- https://zerotoroot.me/steganography-hiding-a-zip-in-a-jpeg-file/
author: 'Pawel Mazur'
date: 2021-09-09
modified: 2022-10-09
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
Stages and Predicates
Stage 0: condition
commands and a1 and a2Stage 1: commands
commands:
type: EXECVE
a0: cat
Stage 2: a1
a1:
a1|endswith:
- '.jpg'
- '.png'
Stage 3: a2
a2:
a2|endswith: '.zip'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.