# Rick Roll Do Not Listen (Grab Bag 100)

We're given an audio file of Rick Astley's "Never Gonna Give You Up".

I've gotta admit that I struggled on this longer than I should have. I tried doing spectrum analysis, frequency analysis, binwalking, etc.. No dice.

Turns out, the secret data is embedded as audio samples inside of the audio file. This is a common steganography technique with audio files, since image and audio steganography differ greatly.

We can use steghide to pull the embedded data outside of the audio sample.

```
$ steghide extract -sf RR.wav
...
MCA{asFSA9123mflZ01f}
```

Original writeup (https://github.com/shawnduong/ctf-writeups/blob/master/2019-MITRE-STEM/Rick-Roll-Do-Not-Listen.md).