From the McAfee Labsl Blog:
We discovered another fake antivirus/antimalware tool late in August. The "Windows 8 Security system" claims to detect infections, and displays alerts to scare users into purchasing protection. The real infection, of course, is the Win 8 Security System itself. It's no surprise that developers of rogue antivirus software are playing up the connection to Windows 8, which Microsoft plans to release at the end of October.
Win 8 Security System is quite similar to fake AV product Windows Ultra-Antivirus and is extremely aggressive and hard to remove. A victim's system gets infected with Win 8 Security System after visiting an infected website. Recent exploits teach us it is easy to fall victim to rogue software like Win 8 Security System, which extort money from PC owners to "fix" their systems. McAfee Labs recommends disabling Java in your browsers and running your antimalware software with real-time protection enabled. You should also be careful with downloading files from torrents or clicking on email and chat links.
Win 8 Security System will display lots of fake alerts and messages and will show a scan window on each system boot. It will display lots of detections, though it is obvious these are fake. [Screenshot]
Continued : http://blogs.mcafee.com/mcafee-labs/win-8-security-system-another-fake-antivirus-malware