Win32.BackAttack is a backdoor program that also has Trojan abilities.  Its Trojan capabilities allow it to enter a system under stealth means.  One of the most common approaches to entry is through an infected e-mail attachment.  Many attackers will claim to be legitimate files but they are in fact viruses.  Once downloaded, you have infected your system.  This pest will come in and then allow a hacker – usually the virus’ author – to enter and take over your system.

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