Stegano
Invisible [50 Pts]
Description
Sometimes it’s a relief to be invisible. CYBERGON_CTF2024 Author - iamkfromburma
Solution
Given an image filechallenge1.jpg, let’s try find something using Aperisolve.
There’s something interesting in the Red section.
We can see that there’s getyourflag on the bottom left of the picture.
let’s try using steghide extract -sf challenge1.jpg and getyourflag as the passphrase
and we got a flag.txt file
Flag
CYBERGON_CTF2024{n07h1ng_5t4ys_h1dd3n}
Truesight [50 Pts]
Description
If you are waiting for a sign, this is it. CYBERGON_CTF2024 Author - iamkfromburma
Solution
We are given a png file but is corrupted. let’s try checking it using a hexeditor
As expected, we’re missing the first 8 bytes of the png header. let’s try adding it
Save it and we can now view the png file
Flag
CYBERGON_CTF2024{y0u_g07_7h3_r!gh7_s!gn5}
What’s behind the wall ? [50 Pts]
Description
Find the secret behind the wall ? CYBERGON_CTF2024 Author - iamkfromburma
Solution
We are given an imagechallenge4.jpg and a JS.txt file from the challenge.
Let’s try check the image metadata first using exiftool
winteriscoming on user comment, maybe we can use it for something related to txt files. since there is nothing else we can do by using jpg files. let’s try to find some steganography tools related to Text.
After some research, I found a tool called Snow and it’s for a text-based steganography. let’s try using it
Command: ./SNOW.EXE -C -p "winteriscoming" JS.txt
Output: 3X1f_w1th_5n0w5
Flag
CYBERGON_CTF2024{3X1f_w1th_5n0w5}
Misc
Triple Quiz [50 Pts]
Description
You’ll recognize it when you see it, it’s something you’ve already done before. CYBERGON_CTF2024 Author - iamkfromburma
Solution
We are given a password protected rar file. we can try to crack it using john the ripper.ICEMAN
After extracting the rar file, we got a .wav file. By hearing it, I suspect that this audio is a morse code.
Let’s try decode it using Morse Code Decoder and we got this 6 666 777 7777 33 9 444 8 44 8 66 444 66 33
let’s try using cipher identifier in dcode
Flag
CYBERGON_CTF2024{MORSEWITHTNINE}