Trojan horse

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Definitions:

A computer program that appears to have a useful function, but also has a hidden and potentially malicious function that evades security mechanisms, sometimes by exploiting legitimate authorizations of a system entity that invokes the program.
Sources:
CNSSI 4009-2015 under trojan horse
NIST SP 800-12 Rev. 1 from CNSSI 4009
NIST SP 800-82r3 from RFC 4949

A useful or seemingly useful program that contains hidden code of a malicious nature that executes when the program is invoked.
Sources:
NIST SP 800-28 Version 2

Glossary Comments

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See NISTIR 7298 Rev. 3 for additional details.