5/21/2023 0 Comments Hopper disassembler read memory![]() To that end, some of the functionality found The PE Explorer Disassembler is designed to be easy to use compared Immunity Debugger is a branch of OllyDbg v1.10, with built-in support Intel Mac, Windows and iOS (ARM) executables.Īn open-source 圆4/x32 debugger for windows. Lets you disassemble, decompile and debug (OS X only) your 32/64bits Hopper is a reverse engineering tool for macOS and Linux, that On a custom IL to quickly adapt to a variety of architectures, It focuses on a cleanĪnd easy to use interface with a powerful multithreaded analysis built It runs on the command line, but it has a graphical interface called Cutter that has support for some of its features already.īinary Ninja is a reverse engineering platform. It actually supports many architectures (x86, dex and Java classes), apart from support for filesystem images and many more features. Radare2 is an open source tool to disassemble, debug, analyze and Users may also develop their own Ghidra plug-in components and/or scripts using Java or Python. Ghidra supports a wide variety of process instruction sets and executable formats and can be run in both user-interactive and automated modes. Windows, Mac OS, and Linux.Ĭapabilities include disassembly, assembly, decompilation, graphing, and scripting, along with hundreds of other features. Ghidra is a software reverse engineering (SRE) framework created and maintained by the National Security Agency Research Directorate. This is a somewhat tricky and even complex question, in a sense that you can go quite deep with this.You didn't mention a platform (Windows, Linux, macOS, etc), but here are some great disassemblers. But to simplify things a bit:Ĭonsidering your example of " reading the timer in a game of mines":įirst step is to find the memory address. This is usually done with a tool called memory editor(a debugger would do too, in some cases) which can use various methods to find the location of a variable in the process memory. Common way is to look for a certain value(for example the value of the timer) in target process' memory space, then change the target value(e.g. advance the timer) and look for matches again. This process pins down the candidates every iteration until there's only the exact variable left. Taking the address of that variable within the process' memory space is just a matter of a mouse click with a memory editor. Second step is to modify the data in that particular address. How this is done depends on the operating system. With Windows, there's a WinAPI call named WriteProcessMemory which can be used to write pre-defined data to a given address within the target process' memory space. In our example, you would use this function to overwrite the timer variable in the target process with your own desired value, effectively changing the timer in the game. ![]() In practice you'd have to find the target process' process ID, and then attach your rogue process to the target process to gain the ability to modify its memory space. This is quite trivial task, but does not contribute to answering the question so I've left it out as an exercise to the reader. )Īn application is given a range of memory by the OS. Generally, the application has to request the memory but that functionality may be obscured to the programmer because of the language. Languages like C allow for block requests for specific sizes, whereas other languages like C++, C#, and Java allow for requests through the use of keywords like new. Each language has a number of ways to allocate memory, so this is just a brief overview. Releasing the memory back to the OS may either be done explicitly or through a garbage collector.Īccessing the memory within the application depends upon how it was allocated. ![]() C and C++ are the best known for using the concept of pointers to indicate / track where the memory is located. Otherwise, memory access is handled through the class or variable that was created. Most of the time, you don't have to worry about specific memory access within your program. The language constructs and OS effectively obscure that concern for you. Your example of a timer in a game is a great example of where you wouldn't need to worry about the underlying memory allocation. ![]() You'll have a variable representing the timer, and you'll just read from the variable. My answer is relevant for when you are writing the application, whereas zxcdw's answer is relevant for accessing memory that belongs to another application. ![]()
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