The Security People have posted a Red alert on a Worm yhoo32.explr
which comes in Via Yahoo Instant Messenger and Hijacks Internet Explorer installing its own "'Safety'Browser"...which attracts a deluge of spyware!!
http://news.com.com/IM+worm+installs+safe+Web+browser/
No extractor posted yet
Best advice "exit" Yahoo IM after using it until further notice OK or change IM if you can? and ignore strange people or click on messages OK
.Article doesn't give a clue on where the source is
This site has more technical info on this threat
www.facetime.com/securitylabs/threatdetail.aspx?id=2812