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Worms

infected Computers

The Importance of One: Security Starts with You

A computer virus is computer program that can covertly replicate itself on other computers. A virus is often difficult to detect, since it is purposely hidden inside another presumably safe program. Some viruses are spread by using your system as a “host” to distribute or store the virus.
A worm is computer program or application that does not need to hide itself in another program. Worms are designed to be difficult or impossible to detect and tend to replicate themselves using computer networks, rather than individual computers. 

A Trojan horse is a computer program disguised as a valuable program that instead performs some malicious function when used.   Victims are lured into installing a Trojan horse by an interesting file name or promise to perform a useful function.  Trojan horses are used to open up vulnerabilities in your computer – often to use your computer as a host for criminal activity. 

A botnet (robot network) uses a computer in a remote location to infect multiple computer systems with the same virus, worm, or Trojan horse.  Botnets create mass distribution capabilities for Internet thieves.  Botnets are difficult to detect, since they do not disable a computer entirely, as Internet access is needed to send and receive files and information.  Botnets can overload networks and shut down servers, but more importantly, it can operate completely undetected, collecting personal information, sending spam, or perpetrating a host of other malicious activity. 

Protect your system from becoming infected with these tips:

Viruses

Worms

Trojan Horses

Recommended Practices

Removing the Infection

Latest Threats - Symantec Threat Explorer

Security and Antivirus Sites