Trojans
What is a trojan?
A Trojan horse (sometimes shortened to trojan[n 1]), is non-self-replicating malware that appears to perform a desirable function for the user but instead facilitates unauthorized access to the user’s computer system. The term is derived from the Trojan Horse story in Greek mythology.
http://en.wikipedia.org/wiki/Trojan_horse_(computing)
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Trojan watch