License/Legal
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Virus Tutorial
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Virus Tutorial
Virus Tutorial
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Computer Knowledge 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, and mention some of the
Navigation characteristics of a virus hoax.
Keep in mind that not everything that goes wrong with a
computer is caused by a computer virus or worm. Both
hardware and software failure is still a leading cause of
Tutorial Map computer problems.
If you read each page to the end you should be able to Anti-Virus Software
proceed on a page-by-page basis. A "next" button will guide
you. To jump to a specific page please visit our map page. A
listing of anti-virus software vendors is also available. Links
to both of these should appear at the top of each page.
Please also don't forget to read the License/Legal info.
There are license, use, and distribution requirements for
this tutorial, even if it is on the Web.
Virus Introduction...
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Virus Tutorial
Finally, this tutorial can be downloaded to run on your
computer if you have a copy of Adobe Acrobat (a free reader
is available). The links below will allow you to download a
zip file with the tutorial PDF file in it (if you don't
understand the zip compression format please see our info
page on this) and/or a copy of the latest Acrobat PDF
reader. (This copy may lag the posted tutorial as it is only
updated approximately once a month; or less often if
changes were minor.)
Download Tutorial Zip File (800K)
Download Acrobat Reader
New/updated pages:
Added a page on virus naming (11 May 2002); new PDF
file (18 May 2002)
Updated recent history; minor corrections; new PDF
file (10 Jan 2002)
Updated ; added Nimda description (11
Oct 2001)
Entire tutorial updated/redesigned (September 2001)
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Virus Tutorial Home | Virus Intro | Virus Types | Virus History | Virus Protection | Virus Hoaxes | Current Threats
Home | Products | Definitions | Newsletter | Virus Tutorial | Contact
Help! Did you learn anything from these pages? Did they help you? If so, we are grateful and hope that you
will be grateful also. Advertising only pays for a small percentage of the cost of maintaining this Web site. If
you learned something and wish to help you can use the Amazon.com PayPage button below to send a small
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payment in return. Thank you in advance if you choose to do this.
Amazon Honor System
Send mail to webmaster@cknow.com with questions or comments about this web site.
Copyright © 1996-2002 Computer Knowledge, All Rights Reserved
Pray the Rosary for peace.
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Tutorial Map
Tutorial Map
Virus Tutorial
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Here you'll find links to any page in the
tutorial. The list is organized along the
lines of the tutorial so you can see how
the information flows.
Top Level PagesNavigation
Virus Tutorial Home
Virus Intro
Virus Types
Tutorial Map
Virus History
Virus Protection
Virus HoaxesAnti-Virus Software
Current Threats
Introduction to Viruses
Virus Behaviour
Number of Viruses
Virus Names
How Serious are Viruses?
Are There Good Viruses?
Hardware Threats
Software Threats
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Types of Viruses
What Viruses Infect
System Sector
File
Macro
Companion
Cluster
Batch File
Source Code
Visual Basic Worms
How Viruses Infect
Polymorphic
Stealth
Fast and Slow
Sparse
Armored
Multipartite
Spacefiller
Tunneling
Camouflage
NTFS ADS
Virus Droppers
History of Viruses
Summary History Page
Dr. Solomon's History
1986-1987
1988
1989
1990
1991
1992
1993
The Future
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