<Li> The Rabbit (or Wabbit) virus, more a fork bomb than a virus, is written . The Rabbit virus makes multiple copies of itself on a single computer (and was named "Rabbit" for the speed at which it did so) until it clogs the system, reducing system performance, before finally reaching a threshold and crashing the computer . </Li> <Ul> <Li> April: ANIMAL is written by John Walker for the UNIVAC 1108 . ANIMAL asked a number of questions of the user in an attempt to guess the type of animal that the user was thinking of, while the related program PERVADE would create a copy of itself and ANIMAL in every directory to which the current user had access . It spread across the multi-user UNIVACs when users with overlapping permissions discovered the game, and to other computers when tapes were shared . The program was carefully written to avoid damage to existing file or directory structures, and not to copy itself if permissions did not exist or if damage could result . Its spread was therefore halted by an OS upgrade which changed the format of the file status tables that PERVADE used for safe copying . Though non-malicious, "Pervading Animal" represents the first Trojan "in the wild". </Li> <Li> The novel The Shockwave Rider by John Brunner is published, coining the word "worm" to describe a program that propagates itself through a computer network . </Li> </Ul> <Li> April: ANIMAL is written by John Walker for the UNIVAC 1108 . ANIMAL asked a number of questions of the user in an attempt to guess the type of animal that the user was thinking of, while the related program PERVADE would create a copy of itself and ANIMAL in every directory to which the current user had access . It spread across the multi-user UNIVACs when users with overlapping permissions discovered the game, and to other computers when tapes were shared . The program was carefully written to avoid damage to existing file or directory structures, and not to copy itself if permissions did not exist or if damage could result . Its spread was therefore halted by an OS upgrade which changed the format of the file status tables that PERVADE used for safe copying . Though non-malicious, "Pervading Animal" represents the first Trojan "in the wild". </Li> <Li> The novel The Shockwave Rider by John Brunner is published, coining the word "worm" to describe a program that propagates itself through a computer network . </Li>

When was the first trojan horse virus discovered