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Trojan horse, or Trojan, in computing is any malicious computer program which misrepresents itself as useful, routine, or interesting in order to persuade a victim to install it. The term is derived from the Ancient Greek story of the wooden horse that was used to help Greek troops sneak invading the city of Troy.

Trojans are generally spread by some form of social engineering, for example where a user is duped into executing an e-mail attachment disguised to be unsuspicious, (e.g., a routine form to be filled in), or by drive-by download. Although their payload can be anything, many moderns forms act as a backdoor, contacting a controller which can then have unauthorized access to the affected computer.[6] While Trojans and backdoors are not easily detectable by themselves, computers may appear to run slower due to heavy processor or network usage.