There's an ongoing trend among malware authors to either code malware crypters and packers from scratch and sell then at a later stage, or even more interesting, obtain publicly available crypters source code, modify, add extra featured and new encryption routines and make them available for sale. The rise of DIY malware crypters enables literally everyone to fully obfuscate an already detected piece of malware, so that if no extra security measures but only virus signatures scanning are in place, an infection takes place.

At Dancho Danchev's blog.

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