Trojan-horse

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Trojan horse: n.

[coined by MIT-hacker-turned-NSA-spook Dan Edwards] A malicious security-breaking program that is disguised as something benign, such as a directory lister, archiver, game, or (in one notorious 1990 case on the Mac) a program to find and destroy viruses! See back door, virus, worm, phage, mockingbird.