Why does my computer keep opening netbios connections?

netbiosd keeps opening connections to random IP addresses (usually an overseas ISP). Since installing LittleSnitch I've blocked 5 of these connections (2 ISP's in the US, 1 ISP in Poland, 1 ISP in the UK), and am starting to become concerned that I might have some kind of malware.
I intalled ClamXav and checked the whole harddrive with the latest definition, but it didn't come up with anything.
Any ideas?

Using LittleSnitch I have received 3 alerts from netbiosd in the past week.
I have denied all of them after a cursory lookup of the IP addresses using various tools (whois, traceroute)
The blocked entries were:
69.70.43.102, port 137
82.186.105.146, port 47863
125.239.135.130, port 53659
Any idea why netbiosd is trying to contact these IP addresses? I would assume this is along the same lines. I'm getting to the point where I am willing to disable/block netbiosd to keep these messages from coming up, but I don't want to risk undue wear and tear by not sleeping.
I do have screen sharing enabled, but am always behind a firewall. <---don't know if this is related. File and print sharing are not enabled.
Lion 10.7.4, fully updated. MBP/i7 2.6/8GB

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Different conductors/contacts are used for charging and dats. Thus, it still could be a bad cable.
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The disk drive is physically non-functional - Replace the hard drive.
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