Data hidden after the "End of File" marker (EOF), viewable in a Hex editor.
Once extracted, you typically find a file like Bach_Guitar.mp3 or a .jpg of sheet music.
A text file named flag.txt extracted from the image. Bach_Guitar.rar
Typically looks like CTF{...} or FLAG{...} .
Text appearing as "waves" in the audio spectrum. Data hidden after the "End of File" marker
Switch the view to . The flag is often written visually in the higher frequencies of the audio track.
The challenge is a forensics and steganography-themed Capture The Flag (CTF) task. It typically involves investigating an archive containing audio or image files related to classical music (specifically Bach) to find a hidden flag. 1. Initial Analysis File Type: .rar archive. Typically looks like CTF{
Checking the of the .rar file itself (using exiftool ).