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Can't find the pointer value.

 
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redcyclone
How do I cheat?
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PostPosted: Thu Oct 20, 2016 1:00 pm    Post subject: Can't find the pointer value. Reply with quote

I got the address of the recovery frame of a fighting game. I found out what writes to this address but when I search for RDI, it returns 0 results.

I've watched couple of pointer tutorials, they all find the value of pointer with similar method, which part did I mess up?



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 Description:
step1: found out what writes this address
 Filesize:  74.7 KB
 Viewed:  5358 Time(s)

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2.PNG
 Description:
step2: copied rdi address and search it but only got 0 result.
 Filesize:  30.36 KB
 Viewed:  5358 Time(s)

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M-Z
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PostPosted: Thu Oct 20, 2016 2:05 pm    Post subject: Reply with quote

If RDI is calculated somewhere, there may be no such value in memory...
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redcyclone
How do I cheat?
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PostPosted: Thu Oct 20, 2016 2:30 pm    Post subject: Reply with quote

M-Z wrote:
If RDI is calculated somewhere, there may be no such value in memory...

Ha, is there a way to trace how is RDI being calculated?
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M-Z
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PostPosted: Thu Oct 20, 2016 2:35 pm    Post subject: Reply with quote

Well, code executed before contains answer whether it is calculated and how...
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redcyclone
How do I cheat?
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PostPosted: Thu Oct 20, 2016 3:48 pm    Post subject: Reply with quote

M-Z wrote:
Well, code executed before contains answer whether it is calculated and how...

Do you mean this? I assume this is the code executed before RDI+34.



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M-Z
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PostPosted: Thu Oct 20, 2016 4:03 pm    Post subject: Reply with quote

I don't have much experience with 64-bit code.

You should look for instructions which set or add/subtract something to rdi.
Also bear in mind, it is not always linear flow - do Dissect Code to know where code is branching.
You can also go to the calling fuction (stacktrace) to see whether this value is not passed as an argument...
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Zanzer
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PostPosted: Thu Oct 20, 2016 4:59 pm    Post subject: Reply with quote

You're looking for an instruction that looks like
Code:
mov rdi,{blah}
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