Hopper disassembler price code#
The ability to annotate code and even decompile it into semi-readable C-ish code makes it much easier to understand what the disassembled code is doing. If you prefer to read C code, you can get a C-like decompilation of the procedure by pressing Option-Return, or clicking Pseudo Code in the toolbar. Hopper is a powerful tool for disassembling executable code and inspecting the result. You can scroll around, zoom in and out, and even drag the components to different places to get the best view of what's going on. Today, I want to wrap up that discussion with a look at a powerful third-party disassembly tool called Hopper. Press the space bar or click Show CFG while in the procedure, and Hopper breaks it into its component pieces and shows it in a separate window:
If control flow is what we're interested in, we can get a really nifty graph view of the procedure. Hopper inserts arrows like these to show control flow, which makes it much easier to follow code. If you scroll down a bit, you'll notice a blue arrow pointing from the je 0x10000197A instruction to its target. Select either the symbol name or the first byte underneath it and mark it as a procedure by pressing the P key (again, no Command key) or clicking Mark As Procedure in the toolbar. The contents of this method start off as "unexplored", so they're displayed as raw bytes. The one that starts with objc_sel_ is a symbol for the selector, which is less interesting. The one which starts with methImpl_ is the one we want. Press shift-N (no Command key here, Hopper's key commands are a bit eccentric) to get a symbol search window.
It's annoying to scroll around searching for it, but of course Hopper knows all about the symbols in your app. Let's find the initWithName:number: method.
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Fortunately, it's really easy to tell it how to interpret something.
In particular, it doesn't identify Objective-C methods as code. It makes some effort to pick out code and treat it as code, but doesn't get everything right. Fundamentally, some sections of the executable are code and some are data, but you can have Hopper interpret any part in any way. Hopper fundamentally treats all bytes in the executable equally. Tell Hopper to open the executable created from the above code, and it will load it and perform some preliminary analysis: These documents can be saved separately, preserving any comments or annotations you've added from one session to the next.Ĭlick Read Executable in the toolbar or select it from the File menu to get started. Hopper has a concept of documents separate from the binaries you inspect. When you first start Hopper, you get a blank document window. So as you might have guessed from the intro above, Hopper has the ability to analyse the procedures within a binary and generate pseudo code for you.// clang -framework Cocoa -fobjc-arc test.m #import M圜lass : NSObject However, there’s something that up until today (26 February 2014), Hopper couldn’t offer me and that is the ability to export the generated pseudo code.įor today, we’ll be using an example OSX application which I’m currently in the process of developing. I’ve been using Hopper as part of my assessments for the past while and the more I use it the more I love it. It’s got everything you need to get started, it’s affordable and it has a python API to plug in your own scripts. #Hopper #HopperApp #Disassembler #Pseudocode #Decompile #Hopper Plugin #iosįirst off I want to start by saying that if any of you are interested in binary analysis, reverse engineering, or iOS/OSX thick client pen-testing then I recommend you pick up a copy of Hopper Disassembler.
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