A North Korean imposter was uncovered, working as a sysadmin at Amazon U.S., after their keystroke input lag raised suspicions with security specialists at the online retail giant. Normally, a U.S.-based remote worker’s computer would send keystroke data within tens of milliseconds. This suspicious individual’s keyboard lag was “more than 110 milliseconds,” reports Bloomberg.

Amazon is commendably proactive in its pursuit of impostors, according to the source report. The news site talked with Amazon’s Chief Security Officer, Stephen Schmidt, about this fascinating new case of North Koreans trying to infiltrate U.S. organizations to raise hard currency for the Democratic People’s Republic of Korea (DPRK), and sometimes indulge in espionage and/or sabotage.