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$25 - January 12th CTF

by LoroPiana - 12 January, 2022 - 11:41 AM
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LoroPiana  
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#1
(This post was last modified: 12 January, 2022 - 09:38 PM by LoroPiana. Edited 5 times in total.)
CTF #1
PM me on cto with the flag
Solved by @Denmark (with no help 100% keek)

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/
:pepo: :pepo:
https://consume.cf/ctf/index.php
Monkah
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pfp  
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#2
so whats this?
@pfpcio on tg
This post is by a banned member (Denmark) - Unhide
Denmark  
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#3
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 Pepeclap
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