Just got this from Trend they are already detecting known worms that exploit systems not patched with MS08-067 that was released less than 12 hours ago by Microsoft.
http://www.trendmicro.com/vinfo/grayware/ve_graywareDetails.asp?GNAME=TSPY_GIMMIV.A is the first one out of the blocks. I ve got more background technical info on this and I ve found that Trends WFBS blocks IE access to the sites where the encrypted files are stored now that s good, but YOU STILL NEED TO PATCH YOUR SYSTEMS. You will need Trend Pattern file 615 to detect this worm.
Trend also have a security advisory here
I ll post more info as it comes to hand. Thanks Dal for the heads up on this.