Detecting UPnP With Nessus & PVS
Conficker Attacks UPnP
The Conficker worm behavior has been analyzed by many security professionals who have shared their findings with the community (the paper from SRI is a great example). One of the common findings is that Conficker will connect to the local route/gateway via UPnP and make changes to the firewall, if the firewall supports unauthenticated UPnP. If so, it uses UPnP to open a high numbered port in the firewall, allowing access to that port from the Internet.