Help/Support Need help with IDA instruction

G0DSTIER · December 12, 2019

i tried to hack a game that only accept a data of (x8 + 6) otherwise game will crash .

example: attack : 2000 x 8 = 16000 + 6= 16006

IDA address: 0x100518BF8 STR X19, [X20]

so how can I edit that instruction to give an acceptable value such as

100100100 x 8= 800800800 + 6 = 800800806

*incase if needed*

Offset: 1029ccbfc

ASLR: 24b4000

HExdecimal of 800800806 = 2FBB4026

__text:0000000100518BF8 loc_100518BF8                           ; CODE XREF: sub_100518A70+E4↑j
__text:0000000100518BF8                                         ; sub_100518A70+154↑j ...
__text:0000000100518BF8                 STR             X19, [X20]
__text:0000000100518BFC                 LDP             X29, X30, [SP,#0x30]
__text:0000000100518C00                 LDP             X20, X19, [SP,#0x20]
__text:0000000100518C04                 LDP             X22, X21, [SP,#0x10]
__text:0000000100518C08                 LDP             X24, X23, [SP],#0x40
__text:0000000100518C0C                 RET
__text:0000000100518C0C ; End of function sub_100518A70

Updated December 12, 2019 by Rauhiq9a
adding new data

Rook · December 12, 2019

Have you tried writing 2FBB4026 and then C0035FD6?

AlyssaX64 · December 12, 2019

the lines you're trying to modify aren't very helpful they're just storing and loading values, unless you're good with pointers id suggest trying to find the function where damage or score or whatever you're looking for is being called (look for MOV or ADD) and try modding that

G0DSTIER · December 12, 2019

36 minutes ago, DADi said:

Have you tried writing 2FBB4026 and then C0035FD6?

32 minutes ago, sweggyttes said:

the lines you're trying to modify aren't very helpful they're just storing and loading values, unless you're good with pointers id suggest trying to find the function where damage or score or whatever you're looking for is being called (look for MOV or ADD) and try modding that

_text:0000000100518C10                                         ; __text:00000001001F8D10↑p ...
__text:0000000100518C10                 STP             X20, X19, [SP,#-0x20]!
__text:0000000100518C14                 STP             X29, X30, [SP,#0x10]
__text:0000000100518C18                 ADD             X29, SP, #0x10
__text:0000000100518C1C                 MOV             X19, X3
__text:0000000100518C20                 MOV             X20, X2
__text:0000000100518C24                 AND             W8, W19, #7
__text:0000000100518C28                 MOV             W9, #1
__text:0000000100518C2C                 LSL             W8, W9, W8
__text:0000000100518C30                 MOV             W9, #0x8E

i got 2 match from my 1st watchpoint which is

x3 = 0x0000000000002066 and x19 = 0x0000000000002066

@DADi @sweggyttes actually i just try n error with instruction since i'm a complete beginner in IDA and i only know how to locate the data stored but don't know how to mod them. And yup i found the data you suggest me to search for.

if there any idea on how i can mod them i really appreciate it.. 🙏