Virus Names

What's in a name? When it comes to viruses it's a matter of identification to the general public. An anti-virus program does not really need the name … [Read more...]

Number of Viruses

There are more MS-DOS/Windows viruses than all other types of viruses combined (by a large margin). Estimates of exactly how many there are vary … [Read more...]

Virus Behavior

Viruses need time to infect. Not all viruses attack, but all use system resources and often have bugs. Viruses come in a great many different … [Read more...]

Introduction to Viruses

Viruses are a cause of much confusion and a target of considerable misinformation even from some virus experts. Let's define what we mean by … [Read more...]

CKnow Virus Tutorial

Welcome to the Computer Knowledge tutorial on computer viruses. We'll discuss what they are, give you some history, discuss protection from viruses, … [Read more...]

Virus Tutorial Table of Contents

Table of Contents The tutorial is designed to be read start to finish but should you wish to jump directly to a tutorial page, come back here and use … [Read more...]

Stealth Viruses and Rootkits

A virus, by its nature, has to modify something in order to become active. This might be a file, the boot sector, or partition sector (Master Boot … [Read more...]

Fast and Slow Infectors

The term fast or slow when dealing with viruses pertains to how often and under what circumstances they spread the infection. Typically, a virus … [Read more...]

Sparse Infectors

In order to spread widely, a virus must attempt to avoid detection. To minimize the probability of its being discovered a virus could use any number … [Read more...]

Armored Viruses

Armored is a class that overlaps other classes of viruses; maybe multiple times. Basically, an armored virus uses special "tricks" designed to foil … [Read more...]