I've seen this on numerous email groups. All of the affected hacked emails are Yahoo accounts.
I appear to have picked up a virus via Yahoo groups today. I changed my password, set all the groups to no email for the time being, and will be running a deeper virus scan. Don't know what else to do.
Be cautious, I'm not going to be posting much this week - at boy scout camp. If I'm on, it will be just after breakfast, or late evening.