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AoBs Help

 
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2Beastmode4u
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PostPosted: Mon Apr 11, 2011 5:25 pm    Post subject: AoBs Help Reply with quote

Can someone please help me understand how to find AoBs and how to know what to change them to? Thanks.
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Dark Byte
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PostPosted: Mon Apr 11, 2011 5:31 pm    Post subject: Reply with quote

you first find out the code you want to change, then when you've found it you make a aob out of that code and make sure you replace static addresses in the aob with wildcards

example: The original code before you edit it looks like this:
Code:

00525032 - A3 A4EF5700                - mov [0057EFA4],eax
00525037 - B8 10505200                - mov eax,00525010 : [000000C3]
0052503C - A3 A8EF5700                - mov [0057EFA8],eax
00525041 - B8 002A4000                - mov eax,00402A00 : [009D8BE8]
00525046 - A3 ACEF5700                - mov [0057EFAC],eax
0052504B - A0 40665200                - mov ax,[00526640] : [0000]

then the aob would then be:
a3 ** ** ** b8 ** ** ** a3 ** ** ** b8 ** ** ** a0

(probably not the best example, but you get the idea)

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2Beastmode4u
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PostPosted: Mon Apr 11, 2011 5:47 pm    Post subject: Reply with quote

What are wildcards? And no i dont get it... sorry.
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Geri
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PostPosted: Mon Apr 11, 2011 6:47 pm    Post subject: Reply with quote

The wildcards are the ** charachters. Those bytes can be anything. For example if you put in

A3 * * * *

then this aobscan will scan for 5 bytes and the fist one is A3, the rest of them can be anything.

It would find

A3 A4EF5700
A3 A8EF5700
A3 ACEF5700

The first byte is the same and the rest doesn't matter. When you make an aobscan, you will in the bytes that will probably not change, like the first bytes (the instructions) and you can use * for the rest of them.

Try to make a few "Array of bytes" scan in CE and you will see.

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