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toffler
Cheater

Reputation: 0

Joined: 27 Sep 2012
Posts: 38

Posted: Fri Aug 16, 2013 1:06 pm Post subject: Need help tracking jmp

I have a code line in memory view where I have a break point and that looks like this:

Code:

client.Call::Call+143765 - FF 24 85 7CB65500 - jmp dword ptr [eax*4+client.Call::Call+1528EF]

After I press F7 it jumps to a certain address, something like

Code:

client.Call::Call+XXXXXX

I know the value of client.Call::Call and EAX at the break point, so I try to calculate where it jumps before it does and I fail every time because eax*4+client.Call::Call+1528EF is never equal client.Call::Call+XXXXXX where it actually goes.

I need to record all the addresses where jumps go to and I hoped it's eax*4+client.Call::Call+1528EF but it's not and I'm lost Crying or Very sad

What am I missing, can anyone please explain?

Thanks!

Gniarf
Grandmaster Cheater Supreme

Reputation: 43

Joined: 12 Mar 2012
Posts: 1285

Posted: Fri Aug 16, 2013 3:46 pm Post subject: Re: Need help tracking jmp

toffler wrote:

What am I missing, can anyone please explain?

You're mixing up between:

Code:

jmp dword ptr [eax*4+client.Call::Call+1528EF]

and:

Code:

jmp eax*4+client.Call::Call+1528EF

The second one would jump to address eax*4+client.Call::Call+1528EF if it were a valid assembly instruction (which it isn't).
The first one reads the dword at address eax*4+client.Call::Call+1528EF, interprets it as an address and jumps there.
So if eax*4+client.Call::Call+1528EF = 0x12345678, then at address 12345678 you should have a dword equal to client.Call::Call+XXXXXX .

toffler wrote:

I need to record all the addresses where jumps go to

Go to address client.Call::Call+1528EF in the memory dump and you'll see a sequence of dwords. They are all the possible jump targets for this jump, now you problem is to figure out how many different targets your jump has (= maximum eax value at that place).
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toffler
Cheater

Reputation: 0

Joined: 27 Sep 2012
Posts: 38

Posted: Sat Aug 17, 2013 1:48 am Post subject:

Thank you!

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