For any HackTheBox Challenge you need to first look for the Files that can be downloaded or Start instances with a given port on docker.hackthebox.eu and for any zip file first password is always hackthebox.
So, I downloaded the call.zip file and unzipped it with password "hackthebox" and a "Decode" text file is there.
As text file comprises of two different text it suggest that it could be possible that one is a key to the token that needs to be decoded. After searching on google I get to know that Fernet encryption can help us in decoding this code. So, I used this website for decryption.
Now, I got a Base64 code which I decoded and got a new encoded text.
Again, I search about the encryption method which includes all character and Find Malbolge programming language and use that to decode the text.
And finally after a lot of decryption I got the Flag.
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