
During the week of Jan. 15, an innocuous-looking e-mail appeared in thousands of inboxes around the world. Its subject line read, "230 dead as storm batters Europe." The e-mail came with a file attached, bearing a plausible-sounding name like Full Story.exe or Read More.exe. Plenty of people clicked on it. After all, storms really were battering Europe at the time; that week high winds and rain had killed 14 in the U.K. alone. But all great cons have a grain of truth in them somewhere.
The file that arrived with the e-mail was, of course, a computer virus, immediately christened the...