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Is it possible to set a symbol to set to edi,eax, etc. ?

 
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Qvintus
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Joined: 07 Nov 2013
Posts: 32
PostPosted: Wed Jun 11, 2014 8:54 am    Post subject: Is it possible to set a symbol to set to edi,eax, etc. ? Reply with quote
Basicly I want to know if I can make an asm script that then sets example x to be its EDI register?

Working with an address there is hard to aobscan, since it changes doing gameplay and the pattern is quite similar to other places in the code.

Code:

[ENABLE]
alloc(newmem,2048)
alloc(x, 16)
label(returnhere)
label(originalcode)
label(exit)

registersymbol(x)

newmem:
x:
readmem(edi, 16)

originalcode:
fadd dword ptr [edi+4C]
fstp dword ptr [edi+4C]

exit:
jmp returnhere

"game.exe"+16F20B:
jmp newmem
nop
returnhere:
 
[DISABLE]
dealloc(newmem)
dealloc(x, 16)
unregistersymbol(x)
"game.exe"+16F20B:
fadd dword ptr [edi+4C]
fstp dword ptr [edi+4C]
//Alt: db D8 47 4C D9 5F 4C


I know this doesn't work, but should give a basic understanding of what I'm trying to do.
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Gniarf
Grandmaster Cheater Supreme
Reputation: 43

Joined: 12 Mar 2012
Posts: 1285
PostPosted: Wed Jun 11, 2014 9:08 am    Post subject: Reply with quote
Closest thing without using a debugger to periodically set x:
Code:
[ENABLE]
alloc(newmem,2048)
label(returnhere)
label(originalcode)
label(exit)
label(LastKnownEDIValue)
registersymbol(LastKnownEDIValue)

newmem:
 mov dword [LastKnownEDIValue],edi //save EDI at address LastKnownEDIValue

 originalcode:
 fadd dword ptr [edi+4C]
 fstp dword ptr [edi+4C]

 exit:
 jmp returnhere
LastKnownEDIValue:
dd 0 //dd reserves 4 bytes (edi is 4 bytes long, not 16)

"game.exe"+16F20B:
jmp newmem
nop
returnhere:
   
[DISABLE]
dealloc(newmem)
unregistersymbol(LastKnownEDIValue)

"game.exe"+16F20B:
fadd dword ptr [edi+4C]
fstp dword ptr [edi+4C]
//Alt: db D8 47 4C D9 5F 4C
Activate this, then click "add address manually" and type LastKnownEDIValue in the box. The newly created record will contain the value edi had when it entered your code, so basically whatever you access with that fstp dword ptr [edi+4C] can be accessed with a pointer with its base at LastKnownEDIValue and an offset of 4C.
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DO NOT PM me if you want help on making/fixing/using a hack.
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Qvintus
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Joined: 07 Nov 2013
Posts: 32
PostPosted: Wed Jun 11, 2014 9:41 am    Post subject: Reply with quote
Thanks a lot ! Some reason doesn't get the correct address, seems to get the newmem address with an offset of 23.

I believe it's because edi hasn't been set to the correct address at this point.
Apart from that you've helped me understand how to get/set an address.

Nevermind I misunderstood you. This works perfectly!
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