The file can't spread or cause any damage, but you can use it to confirm that your antivirus protections are working well. Use the Internet Ports Database Web site to track down what it might be. The Web interface is useful, but the Domain Name System interface is extremely clever for a quick lookup. A 75-cent discrepancy in accounting records starts the author on an investigation that uncovers hackers in his system who appear to be participating in international espionage. An astronomer who is initially unfamiliar with computer security, his experiences guide both experienced professionals and newcomers through some of the challenges of the field, without getting bogged down in technical details.
Fear is a good short-term motivator.
But the more we fear something, the stronger our urge to investigate becomes, to check that the fear is justified. And when we find that someone misled us, we never trust his warnings again. Humans adapt, so we quickly become accustomed to whatever level of fear originally motivated us. When you drive past a pileup on the freeway, you slow down for the next few miles, but soon afterward, you're speeding again. In my view, our best hope is to show users the consequences of their actions and educate them about the reasons why we ask them to take precautions.