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Memory Address cheating

Posted on 2004-08-14
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Last Modified: 2010-04-17
Hi
I've been trying to create my own trainers for games but whenever I find the memory addresses where certain values are stored, when i restart the game the memory address changes. Is this suppost to happen?
Thanx
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Question by:social_suicide
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6 Comments
 
LVL 11

Expert Comment

by:Jase-Coder
ID: 11799787
Other things maybe using memory at the same time so it the space your game once occupied maybe taken up by another program.
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LVL 4

Expert Comment

by:lexicon_dominus
ID: 11801873
In my opinion what you have to do is, your trainer should locate the game in memory and use relative addressing. As for an example; suppose that you money is kept in DS:ESI register pair which is for the first run of the game 0010:032F; the second run 002F:032F etc.. All you have to do is to find the Data Segment starting address if the values are kept in there...
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LVL 3

Expert Comment

by:str_ek
ID: 11802181
well if you're trying it for win32 just remember that we have abstract address spaces here

and just one more tip.. if you try to hack some realy big apps you're may be out of luck , cos the memory fragmentation due to lack of garbage collector makes some non-one-time-alloced-globals to just "travel aroud" depending on the allocation history... in that case you must form an regular expresion to search for, or retrack manualy, by value chnges
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LVL 3

Expert Comment

by:teratoma
ID: 11802928
I'm assuming an Intel processor.  

Given a variable that lives the whole lifetime of the program, there are 3 places where it can be stored: static data, stack, and heap.  If it's just some temporary variable, you don't stand much chance of pegging it.

The only way stack data will survive the whole program run is if it's allocated within maybe one or two calls deep from main, in which case it might as well be static because its offset in memory will only depend on load-time parameters.  Therefore, either the data is at a fixed offset from the start of the program's data, in which case you can predict its location per lexicon's strategy, or it's dynamically allocated, in which case you can't.

Garbage collection has nothing to do with this topic, only whether the variable is allocated on the heap.  Even a one-time allocation from the heap will tend to vary with each run of the program because this memory can be allocated from anywhere within system RAM by the operating system.  
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LVL 4

Accepted Solution

by:
lexicon_dominus earned 115 total points
ID: 11804369
Hello again;
You can find tutorials about game trainers here:
http://www.gamehacking.com/sites/beginner.php
Another useful site about the subject :
http://programmers-corner.com/viewTutorial.php/30
Another site (You can find general information here and also there is a tutorial about starcraft trainer)
http://win32assembly.online.fr/tutorials.html

Hope these helps...
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Author Comment

by:social_suicide
ID: 11818857
Thanx for all the comments. I think ill just give up trainer making and leave it 2 the experts. Thanx for the help.
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