Matrix - localo

Category: Stegano
Difficulty: Hard
Author: explo1t

Description

Thｉs is ｙouｒ last chaｎcｅ. Afｔｅr this, there is no turning back. You take the blue pill, the story ends, you wake up in your bed and believe whatever you want to believe. You take the red pill, you stay in Wonderland, and I show you how deep the rabbit hole goes. Remember, all I'm offering is the flag. Nothing more.

Summery

The author provided a matrix.7z.

Solution

1. extract matrix.7z to get matrix.wav
2. use Spectrogram viewer to get password
   
3. use steghide --extract -p "Th3-R3D-P1ll?" -sf matrix.wav to extract redpill.jpg from matrix.wav
4. reverse image search redpill.jpg and diff with the original
   
5. interpret the lights as binary and decode to ascii

01101110
00100001
01000011
00110011
01011111
01010000
01010111
00111111
--------
n!C3_PW?

6. use foremost to extract zip archive from redpill.jpg and use the password to extract it
7. decode secret.txt with base85
6W6?BHW,#BB/FK[?VN@u2e>m8 -> CSCG{St3g4n0_M4s7eR}

Mitigation

• add more layers and do back references, everybody will like this

Flag

CSCG{St3g4n0_M4s7eR}