We just released the our KV2011 virus definition update for Jun 14th. This update involves the detection logic for CVE-2012-1889, which is a 0-day vulnerability that can lead to a remote code execution.
 
According to Microsoft Security Advisory (2719615), CVE-2012-1889 is related to Microsoft XML Core Services, affecting all supported releases of Microsoft Windows, and all supported editions of Microsoft Office 2003 and Microsoft Office 2007. It has already been seen “in the wild” in active attacks.

We strongly recommend KV2011 users to update your virus definition immediately. If you are not using KV2011, here’s the download link for 32-bit and 64-bit installer.