نام فایل : ويروسها-،-كرمها-وتروژانها-15-ص

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What are viruses, worms, and Trojans?
http://www.microsoft.com/athome/security/viruses/fwbenefits.mspx
Viruses, worms, and Trojans are malicious programs that can cause damage to your computer and information on your computer. They can also slow down the Internet, and they might even use your computer to spread themselves to your friends, family, co-workers, and the rest of the Web. The good news is that with an ounce of prevention and some good common sense, you are less likely to fall victim to these threats. Think of it as locking your front door to protect your entire family.
Read on to learn about the characteristics and differences of viruses, worms, and Trojans.
What is a virus?
What is a worm?
What is a Trojan?
How do worms and other viruses spread?
How can I tell if I have a worm or other virus?
Next steps: Reducing your virus risk
What is a virus?
A virus is a piece of computer code that attaches itself to a program or file so it can spread from computer to computer, infecting as it travels. Viruses can damage your software, your hardware, and your files.
Virus (n.)
Code written with the express intention of replicating itself. A virus attempts to spread from computer to computer by attaching itself to a host program. It may damage hardware, software, or information.
Just as human viruses range in severity from Ebola to the 24-hour flu, computer viruses range from the mildly annoying to the downright destructive. The good news is that a true virus does not spread without human action to move it along, such as sharing a file or sending an e-mail.
What is a worm?
A worm, like a virus, is designed to copy itself from one computer to another, but it does so automatically by taking control of features on the computer that can transport files or information. Once you have a worm in your system it can travel alone. A great danger of worms is their ability to replicate in great volume. For example, a worm could send out copies of itself to everyone listed in your e-mail address book, and their computers would then do the same, causing a domino effect of heavy network traffic that would slow down business networks and the Internet as a whole. When new worms are unleashed, they spread very quickly, clogging networks and possibly making you wait twice as long for you (and everyone else) to view Web pages on the Internet.
Worm (n.)
A subclass of virus. A worm generally spreads without user action and distributes complete copies (possibly modified) of itself across networks. A worm can consume memory or network bandwidth, thus causing a computer to stop responding.
Because worms dont need to travel via a "host" program or file, they can also tunnel into your system and allow somebody else to take control of your computer remotely. Recent examples of worms included the
Sasser
worm and the
Blaster
worm.
What is a Trojan?
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