Because the disassembled code of this crackme is too big (in my opinion), I will not explain the whole code. Instead I will just tell you what kind of checks it has and what the password is. (and what are valid serials for the program itself)

This crackme has a few checks it uses. It checks whether the input is a palindrome, and if this is the case it will show you the badguy message. Furthermore it will check in a reversed string if the sequence 'x', 'hax', 'b', and 'zz' appear on a specific location.

You can use a lot of different serials for the program itself, you just have to meet certain requirements. You can replace the questionmarks in the following string by any character you want to get a valid serial: ??xbahzz?

But there is only one serial that will work on the challenge site. You won't find the password in the source of this program, but because I am such a nice guy I will give it to you: xahbxahzzhax