Hackappatoi CTF 2023
The Four Horseman [50 pts]
The Cavaliere is returned. He is awake and he’s ready to unleash the apocalypse. Are you the chosen one? Solving this challenge will give you the access to the war against the four horsemen. Be ready.
Let’s head over to Dogbolt to decompile this.
Immediately, in the Hex-Rays decompilation, I found this string:
upgs{lbher_ernql_gb_fgbc_gur_ncbpnylcfr}
Hm. Seems to be encrypted. Maybe it’s just some ROT offset?
Heading over to https://www.dcode.fr/rot-cipher and using ROT13 gives us the flag!
hctf{youre_ready_to_stop_the_apocalypse}