Check out The Art of Computer Virus Research and Defence By Peter Szor -- you can just skim the table of contents with Google books. Very interesting.
Also, look up Symantec's Digital Immune System..
http://books.google.ca/books/about/The_Art_of_Computer_Virus_Research_and_D.html?id=XE-ddYF6uhYC
Why? Because of this singular idea (section 7.4):
"Virus writers realized quickly that detection of an encrypted virus remains simple for the antivirus software as long as the code of the decryptor itself is long enough and unique enough. To challenge the antivirus products further, they decided to implement techniques to create mutated decryptors."
In a few billion years, we'll have life.
Also, look up Symantec's Digital Immune System..
http://books.google.ca/books/about/The_Art_of_Computer_Virus_Research_and_D.html?id=XE-ddYF6uhYC
Why? Because of this singular idea (section 7.4):
"Virus writers realized quickly that detection of an encrypted virus remains simple for the antivirus software as long as the code of the decryptor itself is long enough and unique enough. To challenge the antivirus products further, they decided to implement techniques to create mutated decryptors."
In a few billion years, we'll have life.
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