Cybergon CTF
Achieved Rank 3 🥉
Invisible
Stegano
✅
Truesight
Stegano
✅
What's behind the wall ?
Stegano
✅
Triple Quiz
Misc
✅
Stegano
Invisible [50 Pts]
Description
Sometimes it's a relief to be invisible. CYBERGON_CTF2024{xxxx_xxxx_xxxxx}
Author - iamkfromburma
Solution
Given an image file challenge1.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{xxx_xxxx_xxxxx}
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_s1gn5}
What's behind the wall ? [50 Pts]
Description
Find the secret behind the wall ? CYBERGON_CTF2024{xxxx_xxxxx_xxxxx}
Author - iamkfromburma
Solution
We are given an image challenge4.jpg
and a JS.txt
file from the challenge.
Let's try check the image metadata first using exiftool
ExifTool Version Number : 13.00
File Name : challenge4.jpg
Directory : .
File Size : 180 kB
File Modification Date/Time : 2024:09:28 01:28:53+07:00
File Access Date/Time : 2024:11:30 18:33:47+07:00
File Inode Change Date/Time : 2024:11:30 18:33:49+07:00
File Permissions : -rwxrwxrwx
File Type : JPEG
File Type Extension : jpg
MIME Type : image/jpeg
JFIF Version : 1.01
X Resolution : 72
Y Resolution : 72
Exif Byte Order : Big-endian (Motorola, MM)
Resolution Unit : inches
Y Cb Cr Positioning : Centered
Exif Version : 0232
Components Configuration : Y, Cb, Cr, -
User Comment : winteriscoming
Flashpix Version : 0100
Image Width : 1920
Image Height : 1080
Encoding Process : Progressive DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:0 (2 2)
Image Size : 1920x1080
Megapixels : 2.1
I saw 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{XXXXXXXXXXXXXXXXXXXXX} Author - iamkfromburma
Solution
We are given a password protected rar file. we can try to crack it using john the ripper.
rar2john Triple_Quiz.rar > cek.hash -> Extracting the hash of the rar file
john --wordlist=/usr/share/wordlists/rockyou.txt cek.hash -> cracking using rockyou
and we get the password 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}
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