Structure_Layout - distorm - Structure Output Quick Reference - Powerful Disassembler Library For x86/AMD64. Powerful Disassembler Library For AMD64. If you wish to see a complete code sample of how to decode a whole binary file, take a look at this sample.
When you want to display disassembly listing of binary code, you should use the decode API. However, when you want to analyze code and extract more information about the instruction itself and its operands you should use the decompose API. For instance, you get "EAX" as register-index 0, or you get "ADD" instruction as I_ADD enum. Original function in C: int f(int a, int b) { return a + b; } Compiled and assembled to: bin = 0x55 0x8b 0xec 0x8b 0x45 0x08 0x03 0x45 0x0c 0xc9 0xc3 Basic API distorm_decode usage example: _DecodeResult res; _DecodedInst disassembled[MAX_INSTRUCTIONS]; unsigned int decodedInstructionsCount = 0; _OffsetType offset = 0; Output: 00000000 (01) 55 PUSH EBP 00000001 (02) 8bec MOV EBP, ESP 00000003 (03) 8b4508 MOV EAX, [EBP+0×8] 00000006 (03) 03450c ADD EAX, [EBP+0xc] 00000009 (01) c9 LEAVE 0000000a (01) c3 RET New API distorm_decompose example:
Dislib.py - distorm - dislib - A Fast Python Library for Reading PE+ Files - Powerful Disassembler Library For x86/AMD64. Downloads - distorm - Powerful Disassembler Library For x86/AMD64. Assembly - Debugging disassembled libraries with gdb. Chapter 3. Analysis. Collections/x86 Disassembly. Reverse Engineering/File Formats. This section will talk about reverse-engineering proprietary file formats.
Many software developers need to reverse engineer a proprietary file format, especially for the purposes of interoperability. For example, every year the Open Office project needs to reverse engineer the Microsoft Office file formats. Furthermore, reverse engineering is required for forensics purposes. The chapters in this section will talk about how to understand a proprietary file format. Typical Features[edit] [edit] Most file formats begin with a "header," a few bytes that describe the file type and version.
Many programmers package their data in some sort of "container format" before writing it out to disk. Blank Space[edit] Some files are made up largely of blank space, for example, .ds_store files generated by OS X. For most purposes, blank space can be ignored. x86 Disassembly/Assemblers and Compilers. Assemblers[edit] Because assembly is such a simple process, disassembly can often be just as simple.
Assembly instructions and machine code words have a one-to-one correspondence, so each machine code word will exactly map to one assembly instruction. However, disassembly has some other difficulties which cannot be accounted for using simple code-word lookups. We will introduce assemblers here, and talk about disassembly later. x86 Disassembly/Resources.
From Wikibooks, open books for an open world Wikimedia Resources[edit] Wikibooks[edit]
x86 Disassembly/Print Version. The Wikibook of x86 Disassembly Using C and Assembly Language From Wikibooks: The Free Library.
x86 Disassembly. x86 Disassembly Preface.
x86 Disassembly/Disassemblers and Decompilers. What is a Disassembler?
[edit] In essence, a disassembler is the exact opposite of an assembler. Free IDA Pro Reverse Code Engineering and Binary Auditing Training Material for University Lectures. Compilers Algorithms. Decompilation and Decompilers Page. Decompilation is actually is pretty underdeveloped area, but many methods developed for compilation and especially for the optimization of object code are directly applicable to the problem.
Students that wish to study this area are strongly advised to learn basic theory of compilation and, especially, classic code optimization methods. Generally one needs to augment pattern-based constructs recovery with control flow and data flow analysis. The program graph analysis is much better suited for recovery of control structures than pure pattern matching although even such a simple approach as peephole refactoring can recover some local control flow constructs. Data flow analysis makes it possible to detect major structures and even somewhat understand their usage.
Another way to extract useful information is slicing. Dr. Old News ;-) Formal methods - Formal Methods Wiki. Formal methods are mathematical techniques for developing computer-based software and hardware systems.
Please update this page or add a new page if you know of relevant online information not included here or would like to maintain information on a particular topic. Use the comp.specification.misc newsgroup, for general formal methods queries. Please link to if you create a permanent hyperlink to this website. In case of problems, please contact Jonathan Bowen. Introduction. Free Disassemblers, Decompilers, Hexadecimal viewers, Hex editors. Ever encountered a situation where you needed to view, disassemble or decompile a binary file, such as a data file, an object file, a library archive, a shared library (or DLL in Windows) or an executable image?
Assembled on this page are several hex viewers (hexadecimal viewers), hex editors, disassemblers and decompilers that will allow you to do precisely that. RetDec RetDec is a decompiler that supports Intel x86, ARM, MIPS, PIC32 and PowerPC executables using formats such as ELF, PE, Mach-O, COFF, AR, Intel HEX and raw machine code. It detects compilers and packers used on the executables, can remove statically-linked library code, extract and use embedded debugging information (DWARF and PDB), reconstruct instruction idioms and C++ class hierarchies (RTTI, vtables), demangle C++ symbols, reconstruct functions and other high level constructs, etc. It has an integrated disassembler, and can output files in C and a Python-like language. 010 Editor - The Professional Text/Hex Editor with Binary Templates.
Decompilation Compiler Specific. Program-Transformation.Org: The Program Transformation Wiki This approach tries to find the reverse mapping of the executable to the source based on analysing the output generated by a specific compiler.
This will usually give better results with respect to generating source code that resembles the original source code. This approach is limited in the sense that a decompiler has to be constructed for each individual compiler. KevinQuitt's approach.
FermaT. Www.program-transformation.org. The Decompilation Wiki. Home SurveysTransformationReengineeringDSLDomain EngineeringDecompilationGenerative Progr.CollectionsCategoriesSystemsConferencesPeopleCompaniesPapers. Boomerang.