“ In mathematics you don't understand things. You just get used to them.”
—John von Neumann
In this chapter you will learn about the advanced self-protection techniques computer virus writers have developed over the years to fight back against scanners. In particular, you will learn about encrypted, oligomorphic, polymorphic1, and advanced metamorphic computer viruses2. Finally, we will look at computer virus generator kits3 that use similar techniques to create different-looking virus variants.
We will examine the various ways in which virus writers have challenged our scanning products over the last decade. Although most of these techniques ...