#Hopper disassembler change code for mac osx#
#Hopper disassembler change code update#
#Hopper disassembler change code Patch#
#Hopper disassembler change code software#
#Hopper disassembler change code code#

Now, let's see how 'Goodbye Byters' is spelled in Hex (you can use an online converter). So, suppose we want to edit the prompted string 'Hello Null Byte' with 'Goodbye Byters'.Īs we saw in the last image, the string is right there! So, find your own way to do that, I'm just giving you some advices! Step 4: Let's Find Out What to Edit. There are some free disassemblers out there, but none is like IDA and Hopper, for example the same gcc (gnu compiler collection) we talked about before has its way to do that. Now, you can't do all this stuff using only IDA.Even less if you use only the IDA Demo. Or you can simply limit yourself to reverse engineering.

#Hopper disassembler change code code#

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. 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. Isn't that enough? You can make a value return always true, to bypass the login, or always false, just because you like it. 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. Now I'll give you some scenarios just to give you reasons to study it yourself: imagine a program that asks for a password. 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). 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. 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. 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. 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. I guess the topic becomes clearer with a practical demonstration. 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.

#Hopper disassembler change code for mac osx#

IDA Pro is available for Linux, Mac OSX and Windows, while Hopper is officially available only for Mac OSX and Linux.

I'm going to use HxD (supported by wine, the windows emulator) on Linux.

#Hopper disassembler change code software#

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). So we are mostly talking about Reverse Engineering.

#Hopper disassembler change code Patch#

The uses are infinite and go from games mods to decrypt obfuscated code, patch security holes, backdooring and iOS applications modding.

#Hopper disassembler change code update#

In some special cases updates may knowingly break the functionality, for instance, by removing components for which the update provider is no longer licensed or disabling a device. This includes fixing security vulnerabilities and other bugs, and improving the usability or performance. Here I'm quoting the definition of 'patch' from Wikipedia, evading any eventual misunderstanding:Ī patch is a piece of software designed to update a computer program or its supporting data, to fix or improve it. Some of you probably know what I'm talking about, but might not know how far can we go with binary patching. Today I'm going to talk about binary patching and why this is an important piece of computer knowledge. What if the code you are trying to reverse engineer is obfuscated or somehow corrupted? What if no way is left? Here comes what I like to call (wrongly and ironically) the 'brute force of reverse engineering'.īefore I even start, as always, I wanted to apologize for any unclear part of the article, due to eventual wrong english grammar or basic concepts errors.