In the recent times, the US witnessed a horrifying attack of cyber war.  A lot of high level websites were put down by a massive cyber-attack which was beyond imagination. The experts have traced a malware worm and virus which was used the attacker to execute the attack. The virus and worm had infected by the system running Windows Operating System. It was reported that these were sent by the way of an email attachment. When the email attachment was opened by the user, the virus and worms in the attachments were programmed in such a way that they had sent requests every second to the remote system.

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