Question

dash uses computer networks and security holes to replicate itsself
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Answer 1

A worm is a small piece of software that uses computer networks and security holes to replicate itself. A copy of the worm scans the network for another machine that has a specific security hole.

Answer 2

Worms uses computer networks and security holes to replicate itself

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Trojan horses have no way to replicate automatically. Worms: A worm is a small piece of software that uses computer networks and security holes to replicate itself. A copy of the worm scans the network for another machine that has a specific security hole.