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Capture The Flag

Miscellaneous Challenges – Cohesion Writeup

These are the writeups for Miscellaneous Challenges of the Cohesion CTF by IEEE NCU.

1. Discord

This is fairly simple challenge, join MeuSec’s discord server.

discord server

Here you can see the flag in an emoji’s name on a message in announcements channel.

flag

The flag is: cohesion.ctf{TH4NK5-F0R-J01N1NG-D15C0RD}

2. Zero Width

ques

This was fairly a simple challenge if you read the description carefully the title is “Zero Width” if you google it, you will get some Unicode cipher. After decoding it you will get the flag. cohesion.ctf{Un1c0de_1s_l33t}.

Miscellaneous Challenges – Cohesion Writeup 1

3. Digital Ink

Miscellaneous Challenges – Cohesion Writeup 2

Here, the description says it all you need to google some keywords like “Digital Ink”, “FilterFirst” which will lead you to a tool through which you could easily extract the file in the form of a text file. But before that let’s also look at the resource given.

ctf

It is a normal jpeg image running steghide will give you nothing. You could download the toolkit from here, and hence solve this challenge. The flag is –> cohesion.ctf{D1git4l_1nk_4lw4ys_w0rks}

4. Deception

Miscellaneous Challenges – Cohesion Writeup 3

This was a slightly long and layered challenge when you look at the resource it’s a text file with some random numbers.

After having a bit of look you will get to know that it is a zip file so to convert it into a zip we will use the xxd command and then extract the file from the zip.

Miscellaneous Challenges – Cohesion Writeup 4

After extracting the file from the zip let’s take a view of the file.

Miscellaneous Challenges – Cohesion Writeup 5

These are HTML entities after changing the file extension from .txt to .html we will get the following text.

Miscellaneous Challenges – Cohesion Writeup 6

This is URL encoding, let’s decode it.

Miscellaneous Challenges – Cohesion Writeup 7

After decoding it we get some hex characters so let’s decode them.

Miscellaneous Challenges – Cohesion Writeup 8

You can see this some type of URL format so lets perform a ROT13 decode to get the actual URL.

Miscellaneous Challenges – Cohesion Writeup 9

We got some Pastebin link let’s open it see what’s inside.

Miscellaneous Challenges – Cohesion Writeup 10

And Voilaa!! we got the flag. Let’s wrap that around the flag format and submit it.

cohesion.ctf{P3rs1st3nce_1s_k3y}

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