Worm

Worm is a computer program that can run independently, can propagate a complete working version of itself onto other hosts on a network, and may consume computer resources destructively. (Source = SANS security glossary).

Definitions

According to the CyBOK (version 1),

Worm. A computer program that can run independently, can propagate a complete working version of itself onto other hosts on a network, and may consume computer resources destructively. (Source = SANS security glossary).