14-10-2010, 01:55 PM
PC Viruses
.How they got the name
What they are
How they spread
How to prevent them
How they got that name
Computer viruses are called viruses because they share some of the traits of biological viruses.
A computer virus passes from computer to computer like a biological virus passes from person to person.
A computer virus “piggybacks” on top of a program or document
And “reproduces (gets executed)
Once running, it’s able to infect other programs or documents
PC VirusesWhat they are
A virus is a small piece of software (code) that piggybacks on real programs, like Excel, that have “embedded executable languages”
Macro languages -- Visual Basic, etc.
Each time the program runs the virus runs, too
and it has the chance to reproduce (by attaching to other programs) or wreak havoc.
PC VirusesWhat they are
E-mail viruses
An e-mail virus moves around in attachments to e-mail messages, and usually replicates itself by automatically mailing itself to dozens of people in the victim's e-mail address book.
PC VirusesWhat they are
Most e-mails are sent as plain ASCII text, which cannot run programs.
Email that uses HTML coding can carry viruses embedded in the HTML coding
PC VirusesWhat they are
Trojan Horse
A Trojan horse is a computer program
The program claims to do one thing
but instead does damage when you run i
Trojan horses have no way to replicate automatically.
Worms
A worm is a small piece of software that uses computer networks and security holes to replicate itself.
It copies itself to the new machine and starts replicating from there
Worms and Trojan horses are actually more common today than viruses.
Antivirus programs offer protection against all viruses, worms, and Trojans
refer to all of these types of malware as viruses.
For more information about this article,please follow the link:
http://www.googleurl?sa=t&source=web&cd=...iruses.ppt&ei=t722TJStA4qgvQOw-8inCQ&usg=AFQjCNH0ViBwQkHkjwcVCRIvCfAXFXKmag