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+---- Thread: xor 'encryption' is not encryption (/showthread.php?tid=3449383)
xor 'encryption' is not encryption - notsteve - Apr 30, 2013
And seeing as I'm a terrible writer, I will let this article explain it to you. http://playingwithothers.com/2012/12/20/decoding-xor-shellcode-without-a-key/ Any crypter that cannot protect your bot at scantime should not be used, AV scanners know how to do basic math and implement this method, rendering xor near useless.
Another protip for the day: any HF crypter that says "supports eof" simply means that it leaves the file completely intact and does not disassemble the headers/sections, meaning it's a fairly worthless and simple product that deserves no more than $5.