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|Noun||1.||malevolent program - a computer program designed to have undesirable or harmful effects|
computer program, computer programme, programme, program - (computer science) a sequence of instructions that a computer can interpret and execute; "the program required several hundred lines of code"
logic bomb, slag code - a set of instructions inserted into a program that are designed to execute (or `explode') if a particular condition is satisfied; when exploded it may delete or corrupt data, or print a spurious message, or have other harmful effects; "a disgruntled employee planted a logic bomb"
trojan, trojan horse - a program that appears desirable but actually contains something harmful; "the contents of a trojan can be a virus or a worm"; "when he downloaded the free game it turned out to be a trojan horse"
computer virus, virus - a software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer; "a true virus cannot spread to another computer without human assistance"
worm - a software program capable of reproducing itself that can spread from one computer to the next over a network; "worms take advantage of automatic file sending and receiving features found on many computers"