Malacious software in the form of microsoft software update

Sophos, the IT security and data protection firm, has released a new warning regarding a fake anti-virus attack. The specialty of this is that it masquerades as Microsoft's security update and tricks the user into installing malicious software. The affected user sees an almost exact replica of the Microsoft update page, but there is a difference. This works only in Firefox, while the real Microsoft update site requires you to use Internet Explorer.

http://www.techtree.com/India/News/Fake_Anti-Virus_Poses_As_Microsoft_Update/551-115324-582.html