Detection rules › Sigma
Steganography Unzip Hidden Information From Picture File
Detects extracting of zip file from image file
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth |
Telemetry coverage
| Platform | Record / event type |
|---|---|
| Linux | auditd EXECVE record: Arguments supplied to the execve system call |
Rule body
title: Steganography Unzip Hidden Information From Picture File
id: edd595d7-7895-4fa7-acb3-85a18a8772ca
status: test
description: Detects extracting of zip file from image file
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: unzip
a1:
a1|endswith:
- '.jpg'
- '.png'
condition: commands and a1
falsepositives:
- Unknown
level: low
Stages and Predicates
Stage 0: condition
commands and a1Stage 1: commands
commands:
type: EXECVE
a0: unzip
Stage 2: a1
a1:
a1|endswith:
- '.jpg'
- '.png'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
a0 | eq |
| field:"a0" kind:eq value:"unzip" |
a1 | ends_with |
| field:"a1" kind:ends_with |
type | eq |
| field:"type" kind:eq value:"EXECVE" |