Matousec has released a new paper (http://www.matousec.com/info/articles/khobe-8.0-earthquake-for-windows-desktop-security-software.php)detailing their proof of concept for using kernel hooking (specifically what they are calling an "argument switch attack") to bypass antivirus software. The concept isn't new, as they acknowledge but the paper is nicely detailed and the use of a race condition of sorts to bypass security checks made when a kernel hook is requested/handled is cool. It should be noted that PatchGuard should provide some protection against this attack though how much is uncertain.