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Is there any EXE packer/EXE Compresser available for application developed in C#/VB.net?
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Exe Packer 2.300 is a standard, free software for file compression and decompression. Since it has been around for years, Exe Packer 2.300 is one of the most popular packers for malicious file obfuscation.
A Packer is a utility which implements compression and some encryption on an executable to make it undetectable by un-packers/virus scanners. Executing a packed executable necessarily un-wraps genuine code and it is then handed over the control. It has the same effect as that of running the unaffected PE file.
UPX is legitimately used to reduce the file size of Portable Executables by around 50%-70%. It is also often used by threat actors to add a layer of obfuscation to their malware. The default version has a "decompress" flag which will retrieve the original code.
upx yourfile.exe will compress the file specified on the command line. All UPX supported file formats can be unpacked using the -d switch, eg. upx -d yourfile.exe will uncompress the file you've just compressed.
Try this one: http://madebits.com/netz/index.php
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