http://elansoftsol.com/images/install.exe?0,1919225
This is turning into a bigger problem than just for the people in the yahoo group. The member's email address has been barred as a prophylactic measure but now the bad guy is sending these naked URLs to what I believe are the entire contents of his yahoo address book. Many of those addresses are much, much more than social contacts.
If you can advise what this malware is, we'd appreciate it. This is going to be a very nasty clean-up job.
Thanks.