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Synonyms for Trojan Horse (same or very similar meaning)

WordNet sense 1 (a subversive group that supports the enemy and engages in espionage or sabotage; an enemy in your midst):
fifth column

WordNet sense 2 (a program that appears desirable but actually contains something harmful):
Trojan

WordNet sense 3 (a large hollow wooden figure of a horse (filled with Greek soldiers) left by the Greeks outside Troy during the Trojan War):
Wooden Horse


From the ODE community, based on WordNetadd/edit