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
The most common solution for the "Milkshake" series of challenges involves visualizing the audio spectrum:
Based on available Capture The Flag (CTF) records, refers to a forensics or steganography challenge from the HackTheBox or OFPPT-CTF platforms, often involving hidden data within audio or multi-layered encoding . 1. Challenge Overview Milkshake18.rar
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.
: Decoding these in sequence reveals the flag, such as OFPPT-CTF{B@$3_64_3ncrypt1on_1s_l3g1t} . 4. Common Flag Formats HackTheBox : HTB{...} OFPPT-CTF : OFPPT-CTF{...} If you have the file, do you want
: Open the extracted audio file in tools like Sonic Visualiser or Spek .
: In Sonic Visualiser, navigate to Pane -> Add Spectrogram -> Channel 1 . The flag is often literally written in the frequencies of the spectrogram. Challenge Overview In some versions (like ), the
: 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
