![]() ![]() Executable compression can be used to prevent direct disassembly, mask string literals and modify signatures. This allows software distributors to stay within the constraints of their chosen distribution media (such as CD-ROM, DVD-ROM, or floppy disk), or to reduce the time and bandwidth customers require to access software distributed via the Internet.Įxecutable compression is also frequently used to deter reverse engineering or to obfuscate the contents of the executable (for example, to hide the presence of malware from antivirus scanners) by proprietary methods of compression and/or added encryption. Software distributors use executable compression for a variety of reasons, primarily to reduce the secondary storage requirements of their software as executable compressors are specifically designed to compress executable code, they often achieve better compression ratio than standard data compression facilities such as gzip, zip or bzip2. Because most scripting languages are designed to work on human-readable code, which has a high redundancy, compression can be very effective and as simple as replacing long names used to identify variables and functions with shorter versions and/or removing white-space. Moreover, some compressed executables have additional requirements, such as those that write the decompressed executable to the file system before executing it.Įxecutable compression is not limited to binary executables, but can also be applied to scripts, such as JavaScript. Most compressed executables decompress the original code in memory and most require slightly more memory to run (because they need to store the decompressor code, the compressed data and the decompressed code). Two programs that can be used to do this are CUP386 and UNP. Some compressed executables can be decompressed to reconstruct the original program file without being directly executed. ![]() Executable compressors are often referred to as "runtime packers", "software packers", "software protectors" (or even " polymorphic packers" and " obfuscating tools").Ī compressed executable can be considered a self-extracting archive, where a compressed executable is packaged along with the relevant decompression code in an executable file. In most cases this happens transparently so the compressed executable can be used in exactly the same way as the original. When this compressed executable is executed, the decompression code recreates the original code from the compressed code before executing it. For the music fair, see Popkomm.Įxecutable compression is any means of compressing an executable file and combining the compressed data with decompression code into a single executable. The loader intercepts system calls to the disk for file read/write, and if the target file is virtualized, the Enigma Virtual Box will emulate the file in memory and return the required result."POPCOM" redirects here. This is the first and only freeware product with such functionality! Why pay up to several thousand dollars for competitive products performing similar functions when you can use an existing freeware solution – the Enigma Virtual Box?Įnigma Virtual Box embeds a special loader into the main application module which runs before the main code of the application. Just run the Enigma Virtual Box, specify the main executable file of your application, add files or directories it uses to the list, and click Process!Įnigma Virtual Box is an absolutely free application that does not require any registration or payment. To protect the application files, we recommend using the Enigma Protector that has a built-in Virtual Box functionality.Įnigma Virtual Box does not require any additional knowledge or modification of the source code of the main executable. Enigma Virtual Box does not provide sufficient protection for virtualized files. ![]()
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