You will have heard already about several clues that the attackers have left in Stuxnet’s code — take it for granted that they have been placed there intentionally. Here’s another one. All Step7 data blocks show a creation date of September 23, 2001. The time of day varies slightly. Since we must assume that Stuxnet was created much later than 2001 and that the 417 and 315 projects were developed by different teams, it seems likely that this date is sending out another message. Before you start to google, be aware that almost any event reported back in late Sep 2001 relates somehow to 9/11. Hot trace or meaningless? We don’t know.