Zula told him what she’d learned, which was that REAMDE was actually spread through a security hole in Outlook, an extremely popular piece of software that, among other things, managed calendars, contacts, and whatnot. In order to do anything significant in T’Rain, you needed to run a reasonably deep vassal network. Coordinated group activities thus became an essential part of game play. Which meant that several of the players in your feudal hierarchy had to be online at the same time, to transact business and conduct war parties, dungeon raids, and the like. Those activities had to be scheduled around Little League practices, dentist appointments, studying for final exams, and so on, and so a stand-alone scheduling system, existing only inside of the T’Rain app, didn’t really serve. A third-party add-on had been created that built a tunnel between T’Rain and Outlook. Most T’Rain players used it. The add-on worked by sending messages back and forth, consisting of invitations to participate in group raids and the like. Most of these were pure text, but it was possible to attach images and other files to such invitations, and therein lay the security hole: REAMDE took advantage of a buffer overflow bug in Outlook to inject malicious code into the host operating system and establish root-level control of the computer, whereupon it could do anything it wanted, including encrypting the contents of all connected drives. First, though, it sent the virus onward to everyone in the victim’s T’Rain contact list.