Viruses come in many types; written using many different infection strategies.<\/strong><\/p>\n<\/div>Computer viruses come in a variety of types. Breaking them into categories is not easy as many viruses have multiple characteristics and so would fall into multiple categories. We’re going to describe two different types of category systems: what they infect<\/a> and how they infect<\/a>. Because they are so common, we’re also going to include a category specific to worms.<\/p>\n What They Infect<\/strong><\/p>\n Viruses can infect a number of different portions of the computer’s operating and file system. These include:<\/p>\n How They Infect<\/strong><\/p>\n Viruses are sometimes also categorized by how they infect. These categorizations often overlap the categories above and may even be included in the description (e.g., polymorphic file virus). These categories include:<\/p>\n Blended Threats<\/strong><\/p>\n And, as you might expect, not all malware operates according to a single rule. Combinations like a Trojan with embedded virus and many other combinations exist. Plus, a single virus may have multiple attack vectors. The categories above are more for understanding a technique than to say these are the single techniques used or even the only techniques used.<\/p>\n Now either click on the virus topic you are interested in or read about each in sequence…<\/p>\n\n
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