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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.
NIST SP 800-12 Rev. 1 under Trojan Horse from
NIST SP 800-82 Rev. 2 under Trojan Horse from RFC 4949
A useful or seemingly useful program that contains hidden code of a malicious nature that executes when the program is invoked.
NIST SP 800-28 Version 2 under Trojan Horse