Any actual data to back up blocking Netbios ports?

I'm willing to be proved wrong. Go ahead.

you made the claim, lets see the data behind it

its up to the claimant to support it with data, not for others to
disprove it.


Ok, you win. I withdraw the claim. Blocking Netbios ports will solve
the world's problems. It will be just as successful as blocking port 25
was at solving the spam problem.