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Trojans are a type of malware that use social engineering to delude unsuspecting users into installing and running apparently genial programs that embody malicious purposes. The world’s first computer trojan (ANIMAL) presented itself as a game of twenty questions, however, it went behind to copy itself onto shared directories and through there could spread across entire computer networks. In late 2005, a trojan-based backdoor trojan ran in the form of ActiveX codecs disguised as a video codecs.