Tryhackme – c4ptur3-th3-fl4g

In this walkthrough, we will be going through c4ptur3-th3-fl4g room by Tryhackme. This room covers the decoding of the most common encoding algorithms that we come across in a CTF or pentest scenarios. Along with, extracting hidden information from audio tracks and images. So, let’s get started.

Resources:

Binary to text: Rapidtables

Swiss army knife for decoding: Cyber chef

Task 1 – Translation & Shifting

Question 1 – c4n y0u c4p7u23 7h3 f149?

can you capture the flag

Question 2 – 01101100 01100101 01110100 01110011 00100000 01110100 01110010 01111001 00100000 01110011 01101111 01101101 01100101 00100000 01100010 01101001 01101110 01100001 01110010 01111001 00100000 01101111 01110101 01110100 00100001

lets try some binary out!

Question 3 – MJQXGZJTGIQGS4ZAON2XAZLSEBRW63LNN5XCA2LOEBBVIRRHOM======

base32 is super common in CTF's

Question 4 – RWFjaCBCYXNlNjQgZGlnaXQgcmVwcmVzZW50cyBleGFjdGx5IDYgYml0cyBvZiBkYXRhLg==

Each Base64 digit represents exactly 6 bits of data.

Question 5 – 68 65 78 61 64 65 63 69 6d 61 6c 20 6f 72 20 62 61 73 65 31 36 3f

hexadecimal or base16?

Question 6 – Ebgngr zr 13 cynprf!

Rotate me 13 places!

Question 7 – *@F DA:? >6 C:89E C@F?5 323J C:89E C@F?5 Wcf E:>6DX

You spin me right round baby right round (47 times)

Question 8 – – . .-.. . -.-. — — — ..- -. .. -.-. .- – .. — -. . -. -.-. — -.. .. -. –.

TELECOMMUNICATION  ENCODING 

Question 9 – 85 110 112 97 99 107 32 116 104 105 115 32 66 67 68

Unpack this BCD

Question 10 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First start by decoding the target text from base64

Then, convert it from Morse code to binary.

Next, we will convert binary to ROT47.

Moving on, we will convert it from decimal notation to text.

Let's make this a bit trickier...

Task 2 – Spectrograms

Question 1 – Download the file

Start with opening the file in Audacity. If you don’t know, where to find it, download it from here. Moving on, open the file in the software and then click on the small black triangle that is beside the track name “secretaudio”. Then, select the option “Spectogram”, this will display our flag.

Super Secret Message

Task 3 – Steganography

Question 1 – Decode the image to reveal the answer.

In this task, we will start with downloading the image and firing steghide on it, which will extract a text file “steganopayload2248.txt” that contains our flag.

wh1terose@fsociety:~/CTF/TryHackme/c4ptur3-th3-fl4g$ steghide --extract -sf stegosteg.jpg 
Enter passphrase: 
wrote extracted data to "steganopayload2248.txt".
wh1terose@fsociety:~/CTF/TryHackme/c4ptur3-th3-fl4g$ ls
secretaudio.wav  steganopayload2248.txt  stegosteg.jpg
wh1terose@fsociety:~/CTF/TryHackme/c4ptur3-th3-fl4g$ cat steganopayload2248.txt 
SpaghettiSteg

SpaghettiSteg

Task 4 – Security through obscurity

In this task, we will find the strings that are hidden within the target file by running the given command below which gives us our required flags.

strings meme.jpg

Question 1 – Download and get ‘inside’ the file. What is the first filename & extension?

hackerchat.png

Question 2 – Get inside the archive and inspect the file carefully. Find the hidden text.

AHH_YOU_FOUND_ME!

Also Read: Tryhackme – Junior Security Analyst Intro

Conclusion:

So that was it. Summarizing this room, we first started with decoding some encoded strings using Cyberchef. Further, in the next task, we get our flag by applying the audio file using a technique called spectogram. Moving on, we extract some stegno text from the image using steghide. Finally, we get our final flags using the “strings” command to view the hidden strings in a binary file. On that note, i will bid a goodbye but remember always to “Hack the Planet”.