Cushion How do I cheat?
Reputation: 0
Joined: 08 May 2022 Posts: 3
|
Posted: Sun May 08, 2022 7:21 pm Post subject: Figuring out CRC Checks |
|
|
Hey, so I've been playing around lately trying to figure out CRC checks and how to bypass them.
there's this game I've been trying to make a bypass for and I've debugged finding out what accesses the entry point of the game, I got these addresses - note when I play around the game and test random addresses in the game nothing accesses them.. that means no CRC checks but there obviously are so I'm wondering, is it only parts of the memory that's being checked? if yes, how can I discover it?:
COUNT - REST OF DATA
25 - 7FFB0EE1CE46 - 66 44 39 02 - cmp [rdx],r8w
1 - 67D5FBC1 - 66 45 8B 00 - mov r8w,[r8]
3 - 145CBB4E8 - 66 8B 1B - mov bx,[rbx]
3 - 145E5E7BD - 66 45 8B 6D 00 - mov r13w,[r13+00]
1 - 7FFB0EE68B4E - 66 41 39 01 - cmp [r9],ax
so basically both the adresses comparing are crc checks, the one who accessed the entry point 25 times (more logical?) or all of these we can see in the pic?
|
|