Write-up – Steganography 100 – Fucking flute

Points: 100
Author: …
Description: Link flute was stolen by Corkami, we have to help him find it!

Remarks : Second steganography challenge in GreHack 2017.


We were provided with one unique file : chall.bmp

 

Looking at the challenge description, we asked ourselves who is Corkami. Let’s Google it!

We found this page explaining about BMP PCM polyglot. Ok, so it is possible to hide audio data into a BMP file. So let’s open it with Audacity!

 

Flag : GH17{it’s_An_Ocarina_Not_A_Flute_!}

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