How does Trojan horse Spread?

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The spread of Trojan horse, there are two main ways: one is through E-MAIL, control procedures are in place to end the Trojan folder attachment sent in the mail, the recipient system will open an attachment as long as the Trojan horse infections; the other is the software to download , a number of non-formal software download site in order to provide for the name of the horse tied up in the software installation procedure, after downloading, as long as the one running these programs, it will automatically install the Trojan.