Full record for worm n.

Definition A program designed to sabotage a computer or computer network; spec. a self-duplicating program which can operate without becoming incorporated into another program.
OED requirements antedating 1975
Earliest cite 1975 J. Brunner 'Shockwave Rider'
Comment We suspect that this is the first use, but we don't need later citations, only antedatings if any exist.
Last modified 6 July, 2008

Citations for worm n.

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1957 J. Blish Seedling Stars 157 The raphe diatoms along the under hull settled into their niches, their jelly treads turning against broad endless belts of crude caddis-worm leather.
1957 J. Blish Seedling Stars 121 He saw what he had hoped to see: the sand-built house of a caddis-worm, clinging to the mountainous slopes of the rock.
1975 J. Brunner Shockwave Rider (1977) 25 Fluckner had resorted to one of the oldest tricks in the store and turned loose in the continental net a self-perpetuating tapeworm, probably headed by a denunciation group ‘borrowed’ from a major corporation, which would shunt itself from one nexus to another every time his credit-code was punched into a keyboard. It could take days to kill a worm like that, and sometimes weeks.
1975 J. Brunner Shockwave Rider (1977) 258 This is indeed the father and mother of a tapeworm. It's of a type known as parthenogenetic. If you're acquainted with contemporary data-processing jargon, you'll have noticed how much use it makes of terminology derived from the study of living animals. And with reason. Not for nothing is a tapeworm called a tapeworm. It can be made to breed. Most can only do so if they are fertilized; that's to say, if they're interfered with from outside. For example, the worm that prevents the Fedcomps from monitoring calls to Hearing Aid, and the similar but larger one that was released at Weychopee—Electric Skillet—to shut down the net in the event of enemy occupation: those are designed to lay dormant until tampered with. That's true of all phage-type worms.
1993 J. Pournelle & S. M. Stirling Prince of Sparta 209 I'll dump it and reboot from WORM.