: In Sonic Visualiser, navigate to Pane -> Add Spectrogram -> Channel 1 . The flag is often literally written in the frequencies of the spectrogram.
: Open the extracted audio file in tools like Sonic Visualiser or Spek . Milkshake18.rar
: Milkshake18.rar (often containing an MP3 or WAV file named milkshake.mp3 ). Category : Forensics / Steganography. : In Sonic Visualiser, navigate to Pane ->
The most common solution for the "Milkshake" series of challenges involves visualizing the audio spectrum: : Milkshake18
If you have the file, do you want to or try a specific decoding sequence in CyberChef? CTFtime.org / Square CTF 2018 / C4: leaky power / Writeup
In some versions (like ), the "Milkshake" challenge is a "CyberChef special combo" involving nested encodings: Layer 1 : Hexadecimal decoding. Layer 2 : Base64 decoding. Layer 3 : Hexadecimal (again). Layer 4 : ROT47.
: You can also use binwalk or foremost to check for appended files within the archive or the MP3 itself, though these often yield no results for this specific challenge type. 3. Encoding-Based Solutions