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.dll injection is the easiest and most common way to write a hack.
To perform an injection, a process is told to load an attacker-controlled .dll file into its space. When loaded, the .dll file adds jumps (or 'hooks') to certain places in the target program that automatically call functions in the .dll file. This allows the .dll file to capture specific events, such as packets being received, commands being typed, or anything else.
- 3Patching
Injection
If you want a program to do it for you without reading any further, feel free to grab the one I wrote. It works well, but can't really be automated. The beatles abbey road wiki.
If you want to learn more about injection, feel free to browse my code here or download the code here. It's my first (and only) Windowsy program, so it might be valuable some day! But seriously, be gentle, and if you think you can improve it I'd welcome the change.
Basically, a program calls CreateRemoteThread() in the foreign process, giving it some code. The code given simply calls LoadLibrary() on your selected .dll file, which loads it into the program's address space.
If you want any more details about how injection works, check out Richter's book or my source code. It's been a long time, and I've always just used that program.
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Code
This section is made up mostly of some code from Programming Applications for Microsoft Windows, by Jeffrey Richter. I've modified it greatly, so it's almost entirely my code now, but I always believe in giving credit where credit's due.
Here is the code:
Patching
When loaded, the .dll file, in DLL_PROCESS_ATTACH, typically overwrites sections of the program's code, using WriteProcessMemory(), to point to itself. The overwritten code must also be run before the hack is (or after, but I generally do it before). Otherwise, the commands will never be run, and the program will likely misbehave.
The Patch
The first step to writing the patch is to have the game's code call code controlled by the .dll file. A call is 5 bytes of machine code (E8 + the distance) that alters the stack, so we need one or more instructions that don't touch the stack and that are 5+ characters long. This instruction would make a good candidate:
Once the patch is added, the code will look like this: Tune sweeper 3 07 keygen crack.
The first 5 bytes, 29 90 88 EE 4F, were overwritten with the machine code to make a function call to the .dll-controlled code, the 'wrapper'. The final byte of the machine code, 00, was overwritten by a nop instruction. Leaving the final instruction intact would likely cause problems, since we don't know what the instruction '00' represents, so it is replaced with a safe 'nop'.
The Wrapper
The easiest way to ensure that the original code runs is to create a wrapper in the .dll that has those exact bytes, then jumps to the attackers actual function. This process can be referred to as 'rebounding,' although I prefer just calling it 'writing a wrapper'. Here is what we want the wrapper string to do:
Additionally, it's often a good idea to ensure that all registers are backed up and restored. If you wish to do that, then the wrapper would be:
Which translates to the following machine code:
Where the four unknown bytes are the distance between them and the HackFunction. Obs for mac%c2%a0os%c2%a0x 10.7.5.
The HackFunction can be any function, but remember that no parameters are passed and no return value can be accepted. By modifying the code in the wrapper, both of those are possible. Just remember that the stack has to be left in the same position as it started in.
Code Execution Summary
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Here is a summary of what happens:
- The process executes normally until reaching the patch
- At the patch, the process calls the wrapper
- The over-written instruction(s) run in the wrapper
- The wrapper saves the registers
- The wrapper calls the hack function
- The hack function does whatever the programmer intended
- The hack function returns back to the wrapper
- The wrapper restores the variables
- The wrapper returns back to the ordinary code
- Program continues executing normally
The actual patch is done with the following C code. Note that this isn't the best way to do it, this could be cleaned up a lot, but this is the most straight forward way:
Questions
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Feel free to edit this section and post questions, I'll do my best to answer them. But you may need to contact me to let me know that a question exists.