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lolAnonymous
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Posts: 154
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 Posted: Thu Aug 03, 2017 11:46 am Post subject: Assembly question (while hacking a game) |
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Hey guys, I am learning Assembly and I just found something odd while hacking a game...
well here is a assembly of coins in a game :-
| Code: |
"game.exe 2.s86"+E1E7B: 8B 51 0C - mov edx,[ecx+0C]
// ---------- INJECTING HERE ----------
"game.exe 2.s86"+E1E7E: 8B 71 08 - mov esi,[ecx+08] - coins
"game.exe 2.s86"+E1E81: 89 45 DC - mov [ebp-24],eax
// ---------- DONE INJECTING ----------
"game.exe 2.s86"+E1E84: 8B 41 14 - mov eax,[ecx+14]
"game.exe 2.s86"+E1E87: 89 75 E4 - mov [ebp-1C],esi
"game.exe 2.s86"+E1E8A: 89 55 0C - mov [ebp+0C],edx
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and if I make these changes the game will give me gems instead of coins
| Code: |
game.exe 2.s86+E1E7B - 8B 51 0C - mov edx,[ecx+0C]
game.exe 2.s86+E1E7E - C7 45 E4 5A220000 - mov [ebp-1C],0000225A { 8794 }
game.exe 2.s86+E1E85 - 90 - nop
game.exe 2.s86+E1E86 - 90 - nop
game.exe 2.s86+E1E87 - 90 - nop
game.exe 2.s86+E1E88 - 90 - nop
game.exe 2.s86+E1E89 - 90 - nop
game.exe 2.s86+E1E8A - 89 55 0C - mov [ebp+0C],edx
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I am still learning assembly as a beginner but for me this change makes no sense...I don't know if it's a programming question or game hacking...
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OldCheatEngineUser
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Joined: 01 Feb 2016
Posts: 1587
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| Posted: Thu Aug 03, 2017 12:09 pm Post subject: |
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its pretty much clear, injecting point here:
| Code: | "game.exe 2.s86"+E1E7E: 8B 71 08 - mov esi,[ecx+08] - coins
"game.exe 2.s86"+E1E81: 89 45 DC - mov [ebp-24],eax |
after injecting:
| Code: | | game.exe 2.s86+E1E7E - C7 45 E4 5A220000 - mov [ebp-1C],0000225A { 8794 } |
"game.exe 2.s86"+E1E7E: 8B 71 08 - mov esi,[ecx+08] - coins
this module address holding coins instruction, source index is holding your coin address.
and ecx+08 is the total money (after subtraction or addition) to be added to your address.
see after injection "game.exe 2.s86"+E1E7E:
mov [ebp-1C],0000225A
is totally different than the original one.
if you want coins then modify the value of [ecx+08] under newmem or above first instruction in code section.
for example:
2710h equal 10000d
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I Use CE Since Version 1.X, And Still Learning How To Use It Well!
Jul 26, 2020
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lolAnonymous
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Joined: 19 Jul 2015
Posts: 154
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| Posted: Thu Aug 03, 2017 12:24 pm Post subject: |
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Hello OldCheatEngineUser thanks for replying...
But I think you didn't get my question because I think I didn't explained it correctly...
Well my question is that by changing this : | Code: | "game.exe 2.s86"+E1E7B: 8B 51 0C - mov edx,[ecx+0C]
// ---------- INJECTING HERE ----------
"game.exe 2.s86"+E1E7E: 8B 71 08 - mov esi,[ecx+08] - coins
"game.exe 2.s86"+E1E81: 89 45 DC - mov [ebp-24],eax
// ---------- DONE INJECTING ----------
"game.exe 2.s86"+E1E84: 8B 41 14 - mov eax,[ecx+14]
"game.exe 2.s86"+E1E87: 89 75 E4 - mov [ebp-1C],esi
"game.exe 2.s86"+E1E8A: 89 55 0C - mov [ebp+0C],edx |
to this : | Code: | game.exe 2.s86+E1E7B - 8B 51 0C - mov edx,[ecx+0C]
game.exe 2.s86+E1E7E - C7 45 E4 5A220000 - mov [ebp-1C],0000225A { 8794 }
game.exe 2.s86+E1E85 - 90 - nop
game.exe 2.s86+E1E86 - 90 - nop
game.exe 2.s86+E1E87 - 90 - nop
game.exe 2.s86+E1E88 - 90 - nop
game.exe 2.s86+E1E89 - 90 - nop
game.exe 2.s86+E1E8A - 89 55 0C - mov [ebp+0C],edx |
gives me gems instead of coins and I love gems :p but why? what is changed in the assembly which tell the game to give gems "with" coins.. ?
Should I make a video?
Thanks in advance 
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OldCheatEngineUser
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Joined: 01 Feb 2016
Posts: 1587
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| Posted: Thu Aug 03, 2017 12:29 pm Post subject: |
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track the stack then.
maybe base pointer/stack frame rate minus 1C is the location that stack point go to get gems value/amount.
EDIT HERE:
and mov [ebp-24],eax the location in stack for coins?
or ebp-0C
i think that make sense.
i apologize for misunderstanding.
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About Me;
I Use CE Since Version 1.X, And Still Learning How To Use It Well!
Jul 26, 2020
| STN wrote: | | i am a sweetheart. |
Last edited by OldCheatEngineUser on Thu Aug 03, 2017 1:33 pm; edited 2 times in total |
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lolAnonymous
Expert Cheater
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Joined: 19 Jul 2015
Posts: 154
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| Posted: Thu Aug 03, 2017 12:39 pm Post subject: |
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| nop I don't think so... tomorrow I will make a video and pm you
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OldCheatEngineUser
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Joined: 01 Feb 2016
Posts: 1587
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| Posted: Thu Aug 03, 2017 12:42 pm Post subject: |
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fine, i have also edited my post, copied&pasted wrong code.
_________________
About Me;
I Use CE Since Version 1.X, And Still Learning How To Use It Well!
Jul 26, 2020
| STN wrote: | | i am a sweetheart. |
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