Virus Definitions
What are computer viruses, worms,
macro and Trojan horses?
What is a virus?
A computer virus, according to Webster's Collegiate Dictionary, is "a computer program usually hidden within another seemingly innocuous program that produces copies of itself and inserts them into other programs or files, and that usually performs a malicious action (such as destroying data)". Two categories of viruses, macro viruses and worms, are especially common today. Computer viruses are never naturally occurring; they are always man-made. Once created and released, however, their spread is not directly under human control. One example of a virus is the Anna Kournikova virus, which comes in the form of a picture sent through e-mail. |
Where
can I get the latest Anti-Virus software?
Specific Viruses Like Macro Virus, Trojan Virus, And Worm
Virus
Macro viruses
A macro is a piece of code that can be embedded in a data file. Some word processors (e.g., Microsoft Word) and spreadsheet programs (e.g., Microsoft Excel) allow you to attach macros to the documents they create. In this way, documents can control and customize the behavior of the programs that created them, or even extend the capabilities of the program. For example, a macro attached to a Microsoft Word document might be executed every time you save the document and cause its text to be run through an external spell checking program. |
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Worms Virus
Worms are very similar to viruses in that they are computer programs that replicate functional copies of themselves (usually to other computer systems via network connections) and often, but not always, contain some functionality that will interfere with the normal use of a computer or a program. The difference is that unlike viruses, worms exist as separate entities; they do not attach themselves to other files or programs. Because of their similarity to viruses, worms are often also referred to as
viruses. |
What is a Trojan horse?
Named after the wooden horse the Greeks used to infiltrate Troy, a Trojan horse is a program that does something undocumented which the programmer intended, but that the user would not approve of if he or she knew about it. According to some people, a virus is a particular case of a Trojan horse, namely one which is able to spread to other programs (i.e., it turns them into Trojans too). According to others, a virus that does not do any deliberate damage (other than merely replicating) is not a Trojan. Finally, despite the definitions, many people use the term "Trojan" to refer only to a non-replicating malicious program. An example of a Trojan horse is W32.DIDer. This virus has been found on the computers of users who have downloaded the popular file-sharing program
Grokster. |
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Another Helpful Site For Viruses Is:
http://www.faqs.org/faqs/by-newsgroup/comp/comp.virus.html
Virus Hoax and Virus Tricks
What is a Virus Hoax?
A virus hoax is NOT a REAL virus. It is still
dangerous and the only protection is to understand how they work.
A virus hoax will try to trick you into doing something that damages
your system. For example, the writers may tell you to search for a
file on your system to see if you have the virus (they pick a file does
exist). They tell you to delete the file ... and guess what ... it
is a file you NEED. A bit of advice for you ... proper virus
removal NEVER involves deleting a single file. Real viruses will
write to your system registry and often will copy to your system in
multiple locations. Deleting a single file only makes it hard to
do the proper virus removal. Usually virus hoaxes are sent through
e-mail messages. You should use anti-virus software that
automatically scans your incoming email messages. |
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Definitions
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