To confound virus scanning programs, virus writers created polymorphic viruses. These viruses are more difficult to detect by scanning because each … [Read more...]

Viruses are sometimes also categorized by how they infect. These categorizations often overlap the categories above and may even be included in the … [Read more...]

While rare, it is possible to infect actual programming source code found on your computer. Source code comes in many forms because of the many … [Read more...]

Early computers used cathode ray tubes (CRTs) for display. These were basically analog TV sets designed to work with a computer video system. The CRT … [Read more...]

Operating systems and programs are complicated pieces of software with up to millions of lines of source code going into their development. While it … [Read more...]

As indicated throughout this tutorial, in order for a virus to do anything, first a program of some type must execute. A virus, no matter what type, … [Read more...]

Would you believe that a virus can infect your files without changing a single byte in the infected file? Well, it's true; two different ways in fact! … [Read more...]

There is a type of virus known as a "cluster" virus that infects your files not by changing the file or planting extra files but by changing the DOS … [Read more...]