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Compare value in assembly

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kagato1980
Cheater

Reputation: 0

Joined: 30 Oct 2020
Posts: 30
Location: The netherlands

Posted: Tue Nov 03, 2020 3:41 pm Post subject: Compare value in assembly

I have the following script:

Code:

[ENABLE]

aobscan(INJECT,89 87 A0 00 00 00 8B 47 64) // should be unique
alloc(newmem,$1000)

label(code)
label(return)

newmem:

code:
push ebx
mov ebx,[edi+000000A4]
sub ebx, 50
mov [edi+000000A0],ebx
pop ebx
jmp return

oldcode:
db 89 87 A0 00 00 00

INJECT:
jmp newmem
nop
return:
registersymbol(INJECT)

[DISABLE]

INJECT:
db 89 87 A0 00 00 00

unregistersymbol(INJECT)
dealloc(newmem)

This script finds a max value, then replaces the input value to the max value minus 50 (hex).

But for each input, I want to check if our current value is 50 hex away from the end value, and if it is, skip the replacement. Otherwise, the input will always be set to max-50, and the max will never be reached.

So, I think something like this needs to be added at the top inside code:

Code:

cmp [edi+000000A0], [edi+000000A4]-50
jle oldcode

I suppose that comparison needs to happen through some temp values in registers, can anyone help?

daspamer
Grandmaster Cheater Supreme

Reputation: 54

Joined: 13 Sep 2011
Posts: 1588

Posted: Wed Nov 04, 2020 3:39 am Post subject:

Code:

[ENABLE]
aobscan(INJECT,89 87 A0 00 00 00 8B 47 64) // should be unique
registersymbol(INJECT)

alloc(newmem,$1000)
label(originalcode)
label(return)

newmem:
push ebx
mov ebx,[edi+a4]
sub ebx,50
cmp [edi+a0],ebx
jle originalcode
mov eax,ebx

originalcode:
pop ebx // clean up
mov [edi+A0],eax
jmp return

INJECT:
jmp newmem
nop
return:

[DISABLE]

INJECT:
db 89 87 A0 00 00 00

unregistersymbol(INJECT)
dealloc(newmem)

_________________

I'm rusty and getting older, help me re-learn lua.

kagato1980
Cheater

Reputation: 0

Joined: 30 Oct 2020
Posts: 30
Location: The netherlands

Posted: Thu Nov 05, 2020 3:45 am Post subject:

Thanks, I managed to get it to work with a little change:

Code:

code:
push ebx
mov ebx,[edi+A4]
sub ebx, 50
cmp eax,ebx
jge originalcode
mov eax,ebx

originalcode:
pop ebx
mov [edi+A0],eax
jmp return

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