Worms that have been created are designed only to spread, and do not attempt to change the systems they pass through. However, the worm showed, even these "payload free" worms can cause major disruption by increasing network and other unintended effects. The worm designed to do more than spread the worm—it might delete system, encrypt in a cryptoviral extortion attack. A very common worms is to brake a backdoor in the infected spot to allow the creation of a "zombie" control of the worm author. Machines are often referred to as botnets and are very commonly used.

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