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A decompiler is a computer program that translates an executable file back into high-level source code. Unlike a compiler , which converts high-level code into machine code, a decompiler performs the reverse process.
The decompiler component is written in C++, and is therefore usable in a stand-alone form. [ 7 ] Scripts to perform automated analysis with Ghidra can be written in Java or Python (via Jython ), [ 8 ] [ 9 ] though this feature is extensible and support for other programming languages is available via community plugins. [ 10 ]
The file format has been reverse-engineered and documentation of it is freely available. [7] [8] The file starts with bytes "ITSF" (in ASCII), for "Info-Tech Storage Format", which is the internal name given by Microsoft to the generic storage file format used for CHM files. [9] CHM files support the following features: Data compression (using LZX)
A decompiler plug-in, which generates a high level, C source code-like representation of the analysed program, is available at extra cost. [4] [5] IDA is used widely in software reverse engineering, including for malware analysis [6] [7] and software vulnerability research.
Executable compression used to be more popular when computers were limited to the storage capacity of floppy disks, which were both slow and low capacity media, and small hard drives; it allowed the computer to store more software in the same amount of space, without the inconvenience of having to manually unpack an archive file every time the ...
The self-extracting executable may need to be renamed to contain a file extension associated with the corresponding packer; archive file formats known to support this include ARJ [1] and ZIP. [2] [3] Typically, self-extracting files for Microsoft operating systems such as DOS and Windows have a .exe extension, just like any other executable file.
OllyDbg is often used for reverse engineering of programs. [9] It is often used by crackers to crack software made by other developers. For cracking and reverse engineering, it is often the primary tool because of its ease of use and availability; any 32-bit executable can be used by the debugger and edited in bitcode/assembly in realtime. [10]
The line-oriented debugger DEBUG.EXE is an external command in operating systems such as DOS, OS/2 and Windows (only in 16-bit/32-bit versions [1]).. DEBUG can act as an assembler, disassembler, or hex dump program allowing users to interactively examine memory contents (in assembly language, hexadecimal or ASCII), make changes, and selectively execute COM, EXE and other file types.