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What can you do with Pointer when dissecting a structure?

 
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rog9001
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PostPosted: Sun May 08, 2016 3:54 pm    Post subject: What can you do with Pointer when dissecting a structure? Reply with quote
As the subject says that is what I am asking.

if a pointer is on the offset of 24
and in the pointer the value I found is at 14 then how would a compare be written? Is it like this:
Code:
cmp [eax+00000024*14],00
je example


I have never dealt with pointers in a data structure so I don't know how to do it.
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++METHOS
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PostPosted: Sun May 08, 2016 4:16 pm    Post subject: Reply with quote
x86:

Code:
newmem:
push edi             //or whatever register
mov edi,[eax+24]
mov edi,[edi+14]
cmp edi,1234ABCD     //or whatever value
pop edi
je cheat
jmp originalcode


You may also need to include a check to see if the pointer data is valid in order to avoid crashes.
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rog9001
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PostPosted: Sun May 08, 2016 5:45 pm    Post subject: Reply with quote
++METHOS Thanks a lot. Actually what does the "*" mean? like in:
Code:
mov eax,[ebx+00002214*4]
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Zanzer
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PostPosted: Sun May 08, 2016 6:25 pm    Post subject: Reply with quote
It means multiply. 2214*4=‭8850‬ (hex)
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++METHOS
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PostPosted: Sun May 08, 2016 6:50 pm    Post subject: Reply with quote
And math rules still apply (i.e. multiplication performed before addition).
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rog9001
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PostPosted: Mon May 09, 2016 12:35 am    Post subject: Reply with quote
Oh ok. Just had to confirm it. I thought it could have been something else Sad
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