Oh, not again! Kyber has been obsolete and outdated for ages, I warned you, you don't listen, I honestly don't understand why. D.Draker never gives bad advice.
On the link below, you can enjoy the precise instructions on bruteforcing that weak "encryption" method.
"Challenge 1: Breaking baby Kyber."
"After a couple of hours (or way less depending on your configurations), we obtain the following solution..." Decrypting the communications:
"From this point, having recovered the four server private keys (one for each communication), the rest of the challenge is straightforward. Having access to the ciphertext from the pcap file, we can use the OQS_KEM_kyber_NS_decaps function to recover the 32-byte shared secret. Here is the example code for the case NS5"
https://blog.quarkslab.com/sandboxaq-ctf-2024.html