it is useles to track them as far as i understand, the attacks are automatic and work in such a way that there are thousands and thousands of infected computers around th world with a specific trojan.
If you track the triggering source than that is a different story.. it would cost too much and yield nothing depending were they are located
They send the command and you get attacked from all the machines and as a result the server will go down unless a hardware firewall is in place to filter out the traffic from getting to the server.
Imagine how much walmart.com ebay.com and all other sites get hit…