A worm is a specialized type of computer virus that can act independently of user interaction. Normally, a virus needs to be installed on a system in order to initialize the program so that the virus can propagate. Worms are more malicious, because they are self-contained and can affect an entire network of computers with little detection. They can spread through email, the Internet or even instant messaging. The purpose of a worm is to collect data and replicate throughout a network.
 
Here are some recommendations to help prevent catastrophe from any type of malware:

• Make sure your anti-virus software and firewall is up-to-date
• Install operating system patches regularly
• Create an external bootable drive as a back-up in the event of a hard drive failure
• Do not open emails or attachments unless they are from a reliable source

If you suspect that your system has been infected, send your computer to a certified technician for service.

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References:
ESET Threat Center
Webroot Computer Viruses

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