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Multilevel Pointers

 
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Pot.Smoking.Terrorist
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PostPosted: Sat Sep 20, 2008 2:49 am    Post subject: Multilevel Pointers Reply with quote

Hi,
I tried to "solve" some Multilevel Pointers in Games like SpaceSiege or BioShock ( Smile ) but when I try to "find out what writes to this adress" (or "read/access" to this adress) and lose some health nothing happens. I only have 1 adress in my list (left-side of CE) and so: I can't try another adress for my Pointer... what I'm doing wrong?

Thanks in advice Smile
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Dark Byte
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PostPosted: Sat Sep 20, 2008 6:02 am    Post subject: Reply with quote

If you mean a pointer address, only use find out what accesses.
If it doesn't find something, try another address (you usually get a list of addresses after that hex scan, just try most of them)

If you mean just finding the code that accesses the health address, try using the kernel debug option in settings->extra and then find what writes/access

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Pot.Smoking.Terrorist
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PostPosted: Sat Sep 20, 2008 11:07 am    Post subject: Reply with quote

Ok... now does the pointer works... but when I do a "access scan" of this pointer I get the same adress as before (before there was the NORMAL adress, no pointer).... I think this should be another adress or I am wrong?
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Dark Byte
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PostPosted: Sat Sep 20, 2008 4:39 pm    Post subject: Reply with quote

it can be confusing sometimes but you just have to try to not get confiused by equal values.

example:
Code:

let's say that 00401234 is your health
mov [eax+34],ebx access your health
ebx contains the value 00401200

so for the first level offset is 34

then do a hexscan for the value 00401200
You'll get a list of results and lets say one of the results is 00508888
find out what accesses 00508888
it returns that mov eax,[edi] accesses 00508888
edi contains the value 00508888

so the 2nd offset is 0

then do a hexscan for 00508888
you'll get a list again etc...


as you notice the address you just added has the value 00508888 and now you're again doing a hexscan for 00508888 . Just be sure not to get conflicted here. First time it was just an address, 2nd time you needed to find the value

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Pot.Smoking.Terrorist
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PostPosted: Sun Sep 21, 2008 9:25 am    Post subject: Reply with quote

Very confusing... I looked again at the Tutorial by "Chase Pain" and I saw this:

When I do a access scan of the lvl1 Pointer the Adress from the Tutorial is different than the first hex scan. mine is the SAME...:
I do a access scan of the lvl1 Pointer and get the same adress I searched before (hex scan)... ?! I'm very sad right now Evil or Very Mad
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