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multi level pointer problem

 
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Sare
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PostPosted: Thu Nov 02, 2017 3:36 am    Post subject: multi level pointer problem Reply with quote

I don't know why but I can't get multi-level pointers to work, what am I doing wrong?
This video will explain my problem:

https://www.youtube.com/watch?v=mgBjBc-nk0s&feature=youtu.be


Game: Prison Architect
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Dark Byte
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PostPosted: Thu Nov 02, 2017 4:06 am    Post subject: Reply with quote

look at the intstruction code and see if you can find out how EAX get's the value it has (e.g there may be an add eax,xxx earlier)
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PostPosted: Thu Nov 02, 2017 4:24 am    Post subject: Reply with quote

I think I found it that you were talking about, but what should I do with it?


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PostPosted: Thu Nov 02, 2017 4:30 am    Post subject: Reply with quote

no, that's a read instruction on the address eax points to.
you need to look for the code using the memoryview disassembler window


Also, my initial guess is that the pointervalue is actually 27c48f00 with an offset of BC

(And you can always try code injection at that spot)

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PostPosted: Thu Nov 02, 2017 4:52 am    Post subject: Reply with quote

Like this?
I think I am pretty lost.

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PostPosted: Thu Nov 02, 2017 5:04 am    Post subject: Reply with quote

yes, but a bit more upwards.
probably something like lea eax,[xxxx] or mov eax,xxxx or add eax,xxxx

but also try what I mentioned earlier, assume that the offset is BC (so search for the address-BC)

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PostPosted: Thu Nov 02, 2017 5:20 am    Post subject: Reply with quote

Should I try instead what accesses this address?

I tried searching for that you told me, it showed me some values that were constantly changing.

I found some potential addresses, but they gave me nothing.



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PostPosted: Thu Nov 02, 2017 7:48 am    Post subject: Reply with quote

it can be ebp is writing, just ensure that ebp isn't accessing multiple addresses.

also keep in mind this is add operation, so it gonna be one of these two:

- eax holds the previous amount of whatever its, and ebp will add the new gained amount. (this might be correct)

- eax is '0' and ebp is writing the new value after total calculation. (in most cases this might not be the right one) (I rarely see such thing but it do exist, so you have to double check this too by a breakpoint or an easier way is to break and trace it)

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PostPosted: Thu Nov 02, 2017 9:53 am    Post subject: Reply with quote

Thank you all for your support, I will try another game and come back to this game when I think I have a better understanding of CE.
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