Decode Me

Solution to Hack The Box Challenge - Decode Me

Problem

Try find the flag!

Solution

There are two strings both of them ends with "=" so probably is related to Base64, but no... Due to the breakline its appears to be a key and the string to decrypt but with what algorithm?

Its fernet cipher by experience (ref). Decrypting...

RCdgTl45OFs8O3tGMlZVNTRRPythcUw6bVxJNmlYJmYkMEBSeFBfdSldeHFwdW5tM3Fwb2htZmUrTGJnZl9eXSNhYFleV1Z6VFNYUVZVTnJMUVBPTkdrS0QsSEFlKERDPDtfPz5+fTVZOTg3dzUuUjJyMC8oJyZKKikoJyYlfHtBeX53djx6eXhxWTZ0c1VUcG9oLnk=

That is a Base64 string. Decrypting with tool

D'`N^98[<;{F2VU54Q?+aqL:m\I6iX&f$0@RxP_u)]xqpunm3qpohmfe+Lbgf_^]#a`Y^WVzTSXQVUNrLQPONGkKD,HAe(DC<;_?>~}5Y987w5.R2r0/('&J*)('&%|{Ay~wv<zyxqY6tsUTpoh.y

WTF???

Searching in the forum found that the challenge was related to another HTB challenge "inferno" that was related to Dante's inferno because in some part it uses a programming language which name is the same that a level in the game. The level/language name is Malbolge and using this tool you get the flag