A Trojan horse is a malicious program that is hidden in other applications. Access to a computer hidden inside a legitimate program, such as a screen saver. It then puts code into the operating system, allowing an attacker to gain access to the infected computer. The Trojans do not spread themselves in general, but are spread by viruses, worms and downloaded software.

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Special: Antivirus for mobile phones, really necessary?
Reference: ZDnet The companies producing antivirus push, mobile operators resist, in this tug of...