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The decompressor stub allocates a block of memory to hold the decompressed data, which stays allocated as long as the executable stays loaded, whether it is used or not, competing for memory resources with other applications all along. On operating systems which read executable images on demand from the disk (see virtual memory), compressed executables make this process less efficient. On modern desktop computers, this is rarely noticeable unless the executable is unusually big, so loading speed is not a primary reason for or against compressing an executable. Thus the compressed executable will load faster on most common systems. However, the speed of various storage media has not kept up with average processor speeds, so the storage is very often the bottleneck. On the other hand, it requires some time to decompress the data before execution begins. Although this does not eliminate the chance of reverse engineering, it can make the process more costly.Ī compressed executable requires less storage space in the file system, thus less time to transfer data from the file system into memory.
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Executable compression can be used to prevent direct disassembly, mask string literals and modify signatures.
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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.
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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.
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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. Executable compression is any means of compressing an executable file and combining the compressed data with decompression code into a single executable.