Hello,
Yes, W32.Extrat was discovered on November 12, 2012.
W32.Extrat is a worm that spreads by copying itself to removable drives and P2P networks. It also opens a back door and steals information from the compromised computer.
Check this -
http://www.symantec.com/security_response/writeup.jsp?docid=2012-111221-3742-99
BLOG from Symantec Security Response Team
W32.Extrat: Syrian Conflict Used To Deliver Xtreme RAT
http://bit.ly/WJB1Mt
Hope that helps!!