Rain or Shine (35 pts)

Solved by: xand, sardinachanx

Problem:

I've been working so hard on problems that I didn't even notice it was raining outside. I decided to take a short break and record some ambient sound for a game I've been working on, and just for fun I stuck a flag somewhere in there too! Can you find it for me?

Files:

rain.wav

Hint:

If you're stuck, start here.

Solution:

Going to the wiki page linked, we see that the first entry under "digital steganography" is:

Concealing messages within the lowest bits of noisy images or sound files.

Binwalking the file shows us that - gasp - there's a tiff image!

Extracting the tiff image with binwalk gives us this scrambled QR code:

Opening it in photoshop, we saw that it could be rearranged - there were already four layers - so we proceeded to rearrange and scan them.

FLAG: sctf{5t3g0n4gr4phy_i5_fun_r1t3?}