| logic bomb | A computer program that uses illegitimate instructions or misuses legitimate instructions to damage data structures; operates at a specific time, periodically, or according to other instructions.
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| Trojan horse | Any computer program that is altered or designed to perform an unwanted or malicious function while appearing to perform a routine or benign function.
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| virus | A malicious program that is secretly inserted into normal software or a computer's active memory and runs when the host runs; causes effects ranging from annoying messages and deletion of data to interference with the computer's operation.
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| worms | A malicious program that attacks a computer system directly, rather than infecting a host program; spreads rapidly through the Internet or e-mail.
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