Windows operating system running and suddenly you find that  pop comes up and asking you to update your windows before clicking on this pop up think again because a Trojan can come to your system by this update. These Trojans are not come with the Windows update center but these all are coming from the fraudulent websites.
When you click on the pop up you are redirected to a website that look like the windows update website and after clicking the URL on that website your computer get infected with the virus attack. This redirected URL asks you to click on “urgent click button” as soon as you click on that button your system comes under the attack and this finally lead to your system crash. In these website the word “install ” is misspelled “intall” so you can easily identify these websites.
This executable file is malware named as Trojan- Dropper:W32/Agent.DYD which brings another malware, identified as Backdoor:W32/Agent.CVU with itself. The webpage has a button labelled “Urgent Install” and a message like — “Get critical update (obligatory) or URGENT: Please intall critical Windows XP/2000/2003/Vista update!”.

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