computer virus
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almost always cause at least some harm to the network, if only by consuming bandwidth, whereas viruses almost always corrupt or devour files on a targeted computer
Payloads
Many worms that have been created are only designed to spread, and don’t attempt to alter the systems they pass through. However, as the Morris worm and Mydoom showed, the network traffic and other unintended effects can often cause major disruption. A “payload” is code designed to do more than spread the worm – it might delete files on a host system (e.g., the ExploreZip worm), encrypt files in a cryptoviral extortion attack, or send documents via e-mail. A very common payload for worms is to install a backdoor in the infected computer to allow the creation of a “zombie” computer under control of the worm author – Sobig and Mydoom are examples which created zombies. Networks of such
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