![]() The simplest tool for binary analysis of C/C++ is a disassembler, which reveals the raw assembly opcodes the compiler produced. Laws concerning reverse engineering third-party programs without permission vary around the world, but in this tutorial we will use an open source program that is safe for everyone to dissect. Realizing just how much other people can learn about your own code!.Reverse engineering protocols and file formats for product compatibility.Verifying a program does what it claims it does.Patching bugs in old, unsupported programs.Doing binary static analysis by hand is still a worthwhile skill, however, with myriad practical uses: We at Veracode have pushed the limits of static analysis (studying a program's behavior without running it) to automatically detect and report security vulnerabilities in our customers' codebases. Hopper is a reverse engineering tool for OS X, Linux and Windows, that lets you disassemble, decompile and debug (OS X only) your 32/64bits Intel Mac, Windows and iOS (ARM) executables! Take a look at the feature list below!Įven if Hopper can disassemble any kind of Intel executable, it does not forget its main platform.No source code? No problem! That's the motto of the binary analyst. Hopper is specialized in retrieving Objective-C information in the files you analyze, like selectors, strings and messages sent. In this article, i am using a paid version of Hopper which cost about $60. I think it is an incredible price given the things we can do with this application. I would recommend you check out the demo version which lets you perform some tasks to get a feel of Hopper. ![]() Anyways, once you download the Hopper app, this is the interface we are looking at. In this article also, we will use the same demo application that we used in Part 26, the GDB-Demo application that you can download from my github profile. I highly recommend that you read Part 26 before you proceeed with this article. Just to quickly recap, the GDB-Demo had a login form like this. It accepts a certain username/password combination in order to allow us to login. Our task is to patch this application in such a way that the application allows us to login even if the username/password combination is not correct. Please note that in this article, we will be debugging and patching the application which is x86 architecture on a laptop, however you can do the same patching with ARM executable as well by copying the binary from the device. Once you have downloaded the GDB-Demo application, run it using Xcode. This will install the application in the IOS simulator. Now our task is to find the location of the application binary on our system. If you run an application in Xcode, it will generate an application directory inside the folder /Users/$username/Library/Application Support/iPhone Simulator/$ios version of simulator/Applications/. In my case, the location is /Users/Prateek/Library/Application Support/iPhone Simulator 6.1/Applications/. Once you are in this directory, you have to find your application folder. Using the command ls -al will give you the created date of these folders. Use the command open DirectoryName and this will open the directory in Finder. Go inside the folder GDB-Demo.app (this is the application bundle) by right clicking on it and choosing the option Show Package contents. Inside this folder, you will find the application binary with the name GDB-Demo. This is the binary that we will provide to Hopper. ![]() Now open Hopper app and go to File->Read Executable To Disassemble. Give the location of the GDB-Demo binary. ![]() Also make sure to quit Xcode but keep the simulator open.
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