Check or Attack Name: PortdCheck

A port daemon or a potential backdoor program has been detected on port 31337 of the target machine. This usually means that an attacker has backdoored the system.

If the process is unauthoized, consider the computer and possibly your network compromised. Follow your company's policy for recovering from a system compromise.

CERT Tech Tips, Steps for Recovering from a UNIX Root Compromise, http://www.cert.org/tech_tips/root_compromise.html