Sigma rule: Steganography Unzip Hidden Information From Picture File

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-5a7136ecf78c, updated 2022-10-09T00:00:00.000Z.

Rule

Title
Steganography Unzip Hidden Information From Picture File
Status
test
Level
low
Author
Pawel Mazur
Date
2021-09-09
Modified
2022-10-09
File
rules/linux/auditd/execve/lnx_auditd_unzip_hidden_zip_files_steganography.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects extracting of zip file from image file

Log source

product
linux
service
auditd

Detection

commands:
    type: EXECVE
    a0: unzip
a1:
    a1|endswith:
        - '.jpg'
        - '.png'
condition: commands and a1

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.stealth
  • attack.t1027.003

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/auditd/execve/lnx_auditd_unzip_hidden_zip_files_steganography.yml

Sources and licences

  • SigmaHQ

    "Steganography Unzip Hidden Information From Picture File" by Pawel Mazur (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/auditd/execve/lnx_auditd_unzip_hidden_zip_files_steganography.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Steganography Unzip Hidden Information From Picture File",
entity page, dataset version ref-5a7136ecf78c, updated 2022-10-09T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/edd595d7-7895-4fa7-acb3-85a18a8772ca (accessed 2026-11-03).
Underlying source: SigmaHQ rule edd595d7-7895-4fa7-acb3-85a18a8772ca, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.