O'Reilly logo

Online! The Book by Wendy Taylor, Chris Pirillo, John C. Dvorak

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

How a Virus Works and Operates

Despite the fact that there are a great number of known viruses, rarely are two identical. Practically all viruses are unique in the ways they infect computer systems and operate within them. However, most harmful and hot viruses manifest themselves as parasitic, overwriting, or companion viruses.

Pirillo's Virus Tip

The easiest way to be infected by a digital nasty is to open an email attachment. Even if you know the person who sent it, don't trust the file. Have your antivirus program running when you open the attachment.

Some companion viruses rename the target file, memorize its new name (for subsequent execution ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required