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Load Code: Cracking Software on OS X
Lets get started First thing to do is to go into the application bundle by right clicking and select Show Package Contents. Then you navigate to e. Here there will be. I opened MainMenu. Here I found the registration sheet. I selected the register… button. Here I looked at the target attribute. It shows which method the button click is connected to. Say it is called registerAction: Try looking for something similar.
Instructions for Installing the Crack Files for MAC
Then you will have a starting point to start looking for the registration code. An alternative is to use class-dump on the executable and search for method names called something with register, serial number etc or a class nammed RegHandler, Reg or something similar. Now that we found a method to inspect, load the executable in gdb. Type break registerA and hit tab to complete our method.
Then we have set a break point. Type run and out application should start running and then stop executing when it reaches our breakpoint. When you trace through the code using stepi you will often see lines like this: What this is a dispatching of a message to an Objective-C object. This is how methods are called in Objective-C. If object is a NSString it will display the string. This basically says which method to call. The good thing about this is that the message selector also happens to be a pointer to the c string name of the method.
The result of the method call is returned in r3. So stw and lwz using these registers usually access local variables in the method. How copy protection works Copy protection can work in many ways. But the way it worked in my case is that I register the product with a name. I then get back a serial number for that registration name from the application maker.
When the program loads it reads my registered name from a file and then performs a calculation on it. This will produce a serial number or seed that is compared with the serial number I have put into my application. What I managed to do was to eventually locate the method that did generation of serial number or seed. I then put a break at that method and rerun the application. Then I did a backtrace to find out which method called the serial number generator at startup. From there on I was able to find the place where the serial number method was called and the code that compared the results afterwards.
What the code did was doing a comparison with a fixed number against the returned seed the registered code and provided serial number are used together to produce some unique seed numbers. In the debugger I used set to set the registered that were compared to the exact same number they were compared against. Then I typed continue to continue execution of code.
The program now ran as registered. So it worked. Patching The last step to do when you have found out how to circumvent the copy protection is to change the executable patch it.
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This you can do with HexEdit. The problem is to find out where in the file to make changes. There are a number of things that are handy to know when doing this: Let's fix our mistake. We're in, and the app thinks we're a legitimate customer. Time to get wasted and party! I recommend Vessel nightclub in downtown San Francisco. Well, not quite. We still need to make our change permanent. As it currently stands, everything will be erased as soon as we quit gdb. We need to edit the code on disk, in the actual binary file.
Let's find a chunk of our edited binary big enough that it likely won't be repeated in the whole binary. That's the memory representation of the code, a whole 8 blocks of four bytes starting at 0xc9c. Taking endianness into account, we must reverse them and we get the following:. The very first byte of the series is the 74 that we switched into By changing it back, we can deduce the original binary code to be:.
Let's open the binary in a hex editor. I used vim, but feel free to use any hex editor at this point. HexFiend has a great GUI. The first part, before the colon, is the address of block. Following it are 16 bytes, broken off in two-byte segments. Incidentally, every Mach-O binary starts with the hex bytes cafebabe.
Drunk Kernel programmers probably thought it'd be funny. Now that we have our beautiful hex code loaded up, let's search for the first two bytes of our code to replace:. Too many results to make sense of. Let's add another two bytes.
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Search for " 8b45" instead and boom, only one result:. And… We're done! Objective-C makes it really easy to mess with an app's internals.
How to Prevent This
Try to program the licensing mechanism for your app in pure C, that will already make it harder for me to find my way around your binary. I am not a skilled hacker-yet with some very basic knowledge I tore this apart in no time. Implementing the various easy tips above takes very little time, yet would have made it enough of a pain for me that I would have given up. Kenneth Ballenegger develops cool Mac and iPhone software.