Yea.. this port is a best friend to anyone who wants to get access to your machine. I have myself gained access and installed various things (IRC bots, Denial of Service bots, BNCs, Proxies, ftp servers, scanning droneware, etc.) onto dialup, DSL, Cable, T1, 10/100/gigabit, etc. connected systems, and it is extremely easy to do so. It usually takes me about 3 minutes to get onto your IPC share and install a kit to any desired folder I so choose.
Do yourself a favor, save huge bandwidth usage fees and close this port (along with 445) I myself have gotten bored of r00ting systems, but I'm not able to say otherwise about other people.