The uses are infinite and go from games mods to decrypt obfuscated code, patch security holes, backdooring and iOS applications modding. So we are mostly talking about Reverse Engineering. The software I'm going to use for the demonstration is Interactive Disassembler, better known as IDA Pro (though I'm going to mention Hopper Disassembler's extremely useful features).įor the tutorial, demo version of IDA is enough, though one part of the article requires a hex editor to save you work (don't worry, I got you covered if you don't have one). I'm going to use HxD (supported by wine, the windows emulator) on Linux. IDA Pro is available for Linux, Mac OSX and Windows, while Hopper is officially available only for Mac OSX and Linux. HOPPER DISASSEMBLER KALI LINUX FOR MAC OSX You can download an evaluation version of Hopper here: You can download an evaluation version of IDA here: I'm assuming that you are using our dear Kali Linux, but this works almost the same way in Windows and Mac OSX. I guess the topic becomes clearer with a practical demonstration. If you want more examples on this, for instance iOS patching, just write in the comments, I'll be pleased to do one! Step 1: Setup a Demo Program to Patch. Let's setup a little C program to reverse engineer (we'll even try to modify it) that simply prints "Hello Null Byte" and waits for an input. In the left panel we've got a list of the functions, the colored bar on the top gives an idea of what the file is made by (represents strings, vars, ecc.), the right panel is the View (which in this case is the Assembly view), and the lower panel is the output. So, because we can't explain every IDA feature with this little program, before going on with the reverse engineering, I'd like to talk about IDA and patching, just to give you an idea. Break: Where We Talk a Bit About IDA and Some Disassemble Scenarios.Īs I said before, my first approach with IDA and Hopper was when I had to reverse engineer an iOS application (of course when you do that, the developer will give you the code, but I had to reverse engineer my own app, which I left the code somewhere over the rainbow, and couldn't find it). Now I'll give you some scenarios just to give you reasons to study it yourself: imagine a program that asks for a password. That program should recognize when the right password will be entered, so it has to be in the code, plain text or hash, it doesn't mind. Isn't that enough? You can make a value return always true, to bypass the login, or always false, just because you like it. Imagine a game where you have to press a combo of buttons to make a move, you'll be able to edit the combo key IDs. Those were some easy examples that don't require knowledge of Assembly and Hex code, but if you know where to edit (I mean fix every piece of the code to not return errors or incorrect buffers, that would occur when you try to edit a variable and the space is too small, for instance), this would be one of your best ways to go. Or you can simply limit yourself to reverse engineering. HOPPER DISASSEMBLER KALI LINUX SOFTWARE.HOPPER DISASSEMBLER KALI LINUX FOR MAC OSX.
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