<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> 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>
when was the first trojan horse virus discovered
when was the first trojan horse virus discovered
ANIMAL
ANIMAL