A worm is similar to virus in design and is considered to be a sub-class of a virus. A worm spreads from computer to computer,but unlike a virus, it has the capabilty to travel without any human action. The biggest danger with a wormis its capability to replicate itself on a system. Hence, rather than your computer sending out a single worm, it could send out hundreds or thousands of copies of itself, creating a huge devastating effect. Due to the copying nature of worm and its capability to travel across networks, the end result in most cases is heavy consumption of system memory( or network bandwidth), causing web servers, network servers and individual computers to stop responding. In recent worm attacks such as the much-talked-about Blaster Worm, the worm was designed to tunnel into a system and allow malicious users to control the computer remotely.
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