In April 2015, a group of researchers from the Singapore University of Technology and Design flew a smartphone-equipped drone up to the 30th floor of an office building and waited. Loaded on the phone was an app that scanned the office's wireless network for an open printer then mimicked it, forcing local computers to connect to the phone instead. Intercepted documents were copied onto a Dropbox account and the file passed along to the real printer for output. The office workers were none the wiser. A month earlier a cyberattack of more malicious intent by the notorious hacker, Weev, resulted in a stream of racist fliers being spewed out of the printers across 12 US universities. The January before, an unidentified hacker held a large Danish paint wholesaler to ransom by entering their network through a printer and locking the entire thing down.