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People should be aware of scammers that are sending out fake security bulletins that attempt to install malicious software on victim's computers.

The e-mail messages claim to describe a ‘Cumulative Security Update for Internet Explorer’ that fixes a critical security flaw in the browser. It comes with a link entitled ‘Download this update’.

When users click on this link, they are taken to a server that attempts to install malicious software known as Trojan-Downloader.Win32.Agent.avk.

This Trojan software then attempts to reach out to other computers on the Internet in order to install more programs on the victim's computer.

The Trojan looks for three different servers and two of them have domains that haven't yet been registered.

Microsoft does send out notification e-mail when it publishes security bulletins, but the links in these alerts take users to the bulletins themselves, not to executable downloads