CTF $25 - January 12th CTF

[946]

CTF #1
PM me on cto with the flag
Solved by @Denmark (with no help 100% )

Big ass clue: https://en.wikipedia.org/wiki/Dual-tone_..._signaling
Second clue: cracked.to ==> static.cracked.to
Third and final clue: https://www.canto.com/blog/audio-file-types/

https://consume.cf/ctf/index.php

[3.695]

so whats this?

@pfpcio on tg

[1.161]

so u look at response headers on initial GET req then u decode some b64 which hints a variable name "song" so u go to ?song=lol basically the param can be anything and then u see an audio file which u hear dual-tone multi-frequency signaling, u decode it and get 69420 which is a subdomain so u GET 69420.consume.cf and look at the set cookie header which u see partition.txt=deleted so u go to /partition.wav and download the file, u slow down the audio to about 0.22x then look at the spectrogram value and see a discord invite so u join the discord and u find the flag wow

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