AUPCTF'23 - Stegnography - Deep

Solution

We are given a wav file. Given the name of the challenge, we know a software called DeepSound

DeepSound is a steganography tool and audio converter that hides secret data into audio files. The application also enables you to extract secret files directly from audio files or audio CD tracks.

So, let's open the file in DeepSound On opening the file, we are presented with a screen asking for a password

The admin gave us the following hint

looking for password ? well thats the iconic dialogue of iron man

Being a Marvel fan, I knew the dialogue was I am Iron Man. So, let's try that as iamironman

Now, going to the Documents folder, we have a file called marvel.exe, simply running it

We are greeted with a question:

How much does Morgan Starks love her dad? [number]

Well, all the marvel fans know the answer is 3000

What is the full form of J.A.R.V.I.S.?

Well, this was a simple google search, Just A Rather Very Intelligent System

What is the full form of AI that replaced J.A.R.V.I.S.?

Again, a simple google search, Friday and the full form is Female Replacement Intelligent Digital Assistant Youth

Congratulations! You are a true Marvel Nerd like Me ;/
Flag format: iron man first appearance year underscore last appearance year in movies

Now, I knew the first Iron Man movie came out in 2008 and the last movie was Avengers: Endgame which came out in 2019. So, the flag is 2008_2019

Flag: aupctf{2008_2019}

All in all, the challenge was fun but involved more OSINT rather than stego.