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Stego Tricks

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Through Security Skills as a Service, we help organizations to defend against the Dark Hacking Arts. Security Skills as a Service is an offensive cybersecurity consultancy model that combines an Intelligent Platform with the top-class, globally distributed, offensive security engineers, delivering high-quality penetration testing results. Security Hubs bring together offensive penetration testing tactics with human behavioral science, providing real-time insights into threat actors' tradecraft and a complete assessment of any risks.

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Extracting data from all files

Binwalk

Binwalk is a tool for searching binary files, like images and audio files, for embedded hidden files and data.
It can be installed with apt, and the source can be found on Github.
Useful commands:
binwalk file : Displays the embedded data in the given file
binwalk -e file : Displays and extracts the data from the given file
binwalk --dd ".*" file : Displays and extracts the data from the given file

Foremost

Foremost is a program that recovers files based on their headers, footers, and internal data structures. I find it especially useful when dealing with png images. You can select the files that Foremost will extract by changing the config file in /etc/foremost.conf.
It can be installed with apt, and the source can be found on Github.
Useful commands:
foremost -i file : extracts data from the given file.

Exiftool

Sometimes, important stuff is hidden in the metadata of an image or file; exiftool can be very helpful to view file metadata.
You can get it from here
Useful commands:
exiftool file : shows the metadata of the given file

Exiv2

A tool similar to exiftool.
It can be installed with apt, and the source can be found on Github.
Official website
Useful commands:
exiv2 file : shows the metadata of the given file

File

Check out what kind of file you have

Strings

Extract strings from the file.
Useful commands:
strings -n 6 file: Extract the strings with min length of 6
strings -n 6 file | head -n 20: Extract first 20 strings with min length of 6
strings -n 6 file | tail -n 20: Extract last 20 strings with min length of 6
strings -e s -n 6 file: Extract 7bit strings
strings -e S -n 6 file: Extract 8bit strings
strings -e l -n 6 file: Extract 16bit strings (little-endian)
strings -e b -n 6 file: Extract 16bit strings (big-endian)
strings -e L -n 6 file: Extract 32bit strings (little-endian)
strings -e B -n 6 file: Extract 32bit strings (big-endian)

cmp - Comparison

If you have some modified image/audio/video, check if you can find the exact original one on the internet, then compare both files with:

cmp original.jpg stego.jpg -b -l

Extracting hidden data in text

Hidden data in spaces

If you find that a text line is bigger than it should be, then some hidden information could be included inside the spaces using invisible characters.󐁈󐁥󐁬󐁬󐁯󐀠󐁴󐁨
To extract the data, you can use: https://www.irongeek.com/i.php?page=security/unicode-steganography-homoglyph-encoder

{% hint style="danger" %}

Through Security Skills as a Service, we help organizations to defend against the Dark Hacking Arts. Security Skills as a Service is an offensive cybersecurity consultancy model that combines an Intelligent Platform with the top-class, globally distributed, offensive security engineers, delivering high-quality penetration testing results. Security Hubs bring together offensive penetration testing tactics with human behavioral science, providing real-time insights into threat actors' tradecraft and a complete assessment of any risks.

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Extracting data from images

identify

GraphicMagick tool to check what kind of image a file is. Also checks if the image is corrupted.

./magick identify -verbose stego.jpg

If the image is damaged, you may be able to restore it by simply adding a metadata comment to it (if it's very badly damaged this won't work):

./magick mogrify -set comment 'Extraneous bytes removed' stego.jpg

Steghide [JPEG, BMP, WAV, AU]

Steghide is a steganography program that hides data in various kinds of image and audio files. It supports the following file formats : JPEG, BMP, WAV and AU. It’s also useful for extracting embedded and encrypted data from other files.
It can be installed with apt, and the source can be found on Github.
Useful commands:
steghide info file : displays info about whether a file has embedded data or not.
steghide extract -sf file [--passphrase password] : extracts embedded data from a file [using a password]

You can also extract content from steghide using the web: https://futureboy.us/stegano/decinput.html

Bruteforcing Steghide: stegcracker stegcracker <file> [<wordlist>]

Zsteg [PNG, BMP]

zsteg is a tool that can detect hidden data in png and bmp files.
To install it : gem install zsteg. The source can also be found on Github
Useful commands:
zsteg -a file : Runs every detection method on the given file
zsteg -E file : Extracts data with the given payload (example : zsteg -E b4,bgr,msb,xy name.png)

stegoVeritas JPG, PNG, GIF, TIFF, BMP

Capable of a wide variety of simple and advanced tricks, this tool can check file metadata, create transformed images, brute force LSB, and more. Check out stegoveritas.py -h to read about its full capabilities. Execute stegoveritas.py stego.jpg to run all checks.

Stegsolve

Sometimes there is a message or a text hidden in the image itself that, in order to view it, must have color filters applied, or some color levels changed. Although you can do that with something like GIMP or Photoshop, Stegsolve makes it easier. It's a small Java tool that applies many useful color filters on images; In CTF challenges, Stegsolve is often a real timesaver.
You can get it from Github
To use it, just open the image and click on the < > buttons.

FFT

To find hidden content using Fast Fourier T:

Stegpy [PNG, BMP, GIF, WebP, WAV]

A program for encoding information in image and audio files through steganography. It can store the data as either plaintext or encrypted.
Find it on Github.

Pngcheck

Get details on a PNG file (or even find out it's actually something else!).
apt-get install pngcheck: Install the tool
pngcheck stego.png : Obtain info about the PNG

Some other image tools worth mentioning

Extracting data from audios

Steghide [JPEG, BMP, WAV, AU]

Stegpy [PNG, BMP, GIF, WebP, WAV]

ffmpeg

ffmpeg can be used to check the integrity of audio files, reporting various information about the file, as well as any errors it finds.
ffmpeg -v info -i stego.mp3 -f null -

Wavsteg [WAV]

WavSteg is a Python3 tool that can hide data, using least significant bit, in wav files. It can also search for, and extract, data from wav files.
You can get it from Github
Useful commands:
python3 WavSteg.py -r -b 1 -s soundfile -o outputfile : Extracts to an output file (taking only 1 lsb)
python3 WavSteg.py -r -b 2 -s soundfile -o outputfile : Extracts to an output file (taking only 2 lsb)

Deepsound

Hide, and check for, information encrypted with AES-265 in sound files. Download from the oficial page.
To search for hidden info, simply run the program and open the sound file. If DeepSound finds any data hidden, you'll need to provide the password to unlock it.

Sonic visualizer

Sonic visualizer is a tool for viewing and analyzing the contents of audio files. It can be very helpful when facing audio steganography challenges; you can reveal hidden shapes in audio files that many other tools won't detect.
If you're stuck, always check the spectrogram of the audio. Offical Website

DTMF Tones - Dial tones

Other tricks

Binary length SQRT - QR Code

If you receive binary data with an SQRT length of an entire number, it could be some kind of QR code:

import math
math.sqrt(2500) #50

To convert binary "1"s and "0"s to a proper image: https://www.dcode.fr/binary-image
To read a QR code: https://online-barcode-reader.inliteresearch.com/

Braile

https://www.branah.com/braille-translator

References

{% hint style="danger" %}

Through Security Skills as a Service, we help organizations to defend against the Dark Hacking Arts. Security Skills as a Service is an offensive cybersecurity consultancy model that combines an Intelligent Platform with the top-class, globally distributed, offensive security engineers, delivering high-quality penetration testing results. Security Hubs bring together offensive penetration testing tactics with human behavioral science, providing real-time insights into threat actors' tradecraft and a complete assessment of any risks.

{% embed url="https://securityhubs.io/" %} {% endhint %}

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