: 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{...}
: Open the extracted audio file in tools like Sonic Visualiser or Spek .
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.
The most common solution for the "Milkshake" series of challenges involves visualizing the audio spectrum:
: Milkshake18.rar (often containing an MP3 or WAV file named milkshake.mp3 ). Category : Forensics / Steganography.
: The RAR archive typically contains a single audio file. Standard tools like file or exiftool confirm it is a valid MPEG audio layer 3 file. 2. Forensic Steps (Audio Analysis)
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
: 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