Steganography

Steganography is a common CTF technique, used to hide information into a file.

Aperi Solve

Aperi'Solve is an online tool for stegano.

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StegCracker

StegCracker is command line utility for cracking stegano challenges. With StegCracker it is possible to brute-force hidden data. Prefer Stegseek, as it is more efficient.

StegCracker usage

stegracker <file> <wordlist>

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Binwalk

Binwalk tool can be used to extract information and files from source.

Binwalk usage

Extract common file types from file:

binwalk -e <file>

Extract all files from file:

binwalk -dd '.*' <file>

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Strings

Strings is a command line utility commonly found natively from *.nix operating systems. Can be used to find information from files.

Strings usage

Find strings from a file:

strings <file>

Use limiter for string length e.g. 8-character limit:

strings -n 8 <file>

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Hexdump

Hexdump can be used for extraction of binary data and files.

Hexdump usage

Display content of a binary file with binary and text and pipe to less:

hexdump -C <file> | less

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Stegseek

Stegseek is an improved version of stegcracker. It can be found here. It can be used to bruteforce password protected content.

Stegseek usage:

Use the Stegseek:

stegseek <file_to_brute> <wordlist_file>