Use strings to look for readable text at the end of the file. Inspect the LSB (Least Significant Bit) using zsteg . Open the file in Audacity .
Check for DTMF tones (phone keypad sounds) that might represent a code. The flag is usually hidden in one of three ways: Bach_Guitar.rar
g., HackTheBox, PicoCTF, or a private lab) to give you the exact flag? Use strings to look for readable text at the end of the file
Checking the of the .rar file itself (using exiftool ). Bach_Guitar.rar
Brute-forcing if the hint suggests a simple word (like "bach" or "guitar").
Check for hidden data using steghide (common password: bach ).
Attempt to extract the archive. Many versions of this challenge are password-protected.