We are given a WAV audio file with nothing understandable so we open it with Audacity and changing the view to spectrum, we can see the first part of the flag “INSA{Aud1o_st3G4n”.

As the description of the challenge says, the complete flag is composed by 2 parts, so we still need the second one.

Opening the file with “DeepSound” this time, we are asked for a password to extract the hidden file, so we can use deepsound2john.py (https://github.com/magnumripper/JohnTheRipper/blob/bleeding-jumbo/run/deepsound2john.py) from (https://ryan.govost.es/2018/03/09/deepsound.html) to crack the password (“azerty”) and retrieve the second part of the flag “0_1s_4lways_Th3_S4me}.

Full flag: INSA{Aud1o_st3G4n0_1s_4lways_Th3_S4me}

By: fikih888