Fu10 Night Crawling 17 18 19 Tor Updated -

Another angle: sometimes people use "crawling" in the context of web scraping or searching the dark web. So "night crawling" might mean some kind of automated scraping that's scheduled at night, but I'm not sure. The numbers could be days in October (17,18,19) when an update happened. Alternatively, the numbers could be part of a filename or a version.