My ms outlook was hacked. 3048,3 error Norton fixed it!

Two days ago everyone on my e-mail contact list received e-mails from my account. No message, just two web sites. As far as I know, not a single one of my contacts "clicked" on the sites. Norton recommended I change my password (I did) & then I ran a full system scan. They found error 3048,3 & fixed it. I don't have any complaints with the Norton product. My deal is this.  Why isn't anyone interested in tracking these crooks down? Is there anybody out there? I have the address of both sites. I'll not post them here in fear that someone would open one of them. Who do I report that stuff to?