Ars Technica: Microsoft is warning Internet users about a new piece of malware that can detect which browser they are using and displays an alert screen that looks just like the real thing. Rogue:MSIL/Zeven appears to scan your system, tell you when you're behind on updates, allow you to change your privacy settings, and find malware. It then asks users to download the "full version" of the product, which costs money.
Browser makers note that at least one of the fake warning screens has a typo, and they remind users not to download software from unknown sources.