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The following are necessary characteristics of a worm:

A worm is not a trojan horse; it is a program designed to replicate. The program may perform any variety of additional tasks as well. The first network worms were intended to perform useful network management functions [SH82]. They took advantage of system properties to perform useful action. However, a malicious worm takes advantage of the same system properties. The facilities that allow such programs to replicate do not always discriminate between malicious and good code.
Thu Mar 10 15:32:44 EST 1994