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How to use AOB in Lua?

 
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24quant42
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Joined: 19 Apr 2023
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PostPosted: Fri Nov 03, 2023 4:32 am    Post subject: How to use AOB in Lua? Reply with quote
In the game I found an address that is responsible for the player’s health.
The problem is that the instruction that does this is also responsible for the operation of more than 2000 addresses. The instructions are in lua51.dll.

How can I add AOB to get the player's health address if this instruction works with 2000 more addresses?
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mrjunior
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Joined: 07 Jul 2018
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PostPosted: Sat Nov 04, 2023 8:16 am    Post subject: Reply with quote
To begin with 2000 addresses is a lot and I would recommend looking for other instruction (unless you know there are 1999 entities currently loaded).
If you got the right instruction, imagine you have operation like this
Code:
mov ebp,[eax+B0]

You know that eax is the address to the structure and B0 is the HP offset. Click "Find out what addresses this instruction accesses". You get a list of addresses, right click on player's address -> "Find commonalities between addresses" -> "Mark as group 1". Select the rest and mark as Group 2. Then go for "Find commonalities between addresses" -> "Scan for commonalities". Choose the register that contains the address (in my example: eax). Run the scan, look for values that are consistently the same for the player, while consistently different for everything else (comparing enemies vs player it could be a convenient 1 for player, 0 for enemies or vice versa). Pick the offset which you feel is right (it might not always be what it is right now, so you'd be better off picking a bunch for future). Then in the code you can simply do something like
Code:
cmp [eax+3C],0 // for example +3C is always 0 for player, and not 0 for enemies
je hookplayer

hookplayer:
  mov [playerBaseAddress],eax
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