Android/Locker.EJ - Duet? in ESET Products for Mobile Devices Posted August 24, 2015 · Edited August 24, 2015 by rugk Today EMS detected Duet as Android/Locker.EJ during an on-charger-scan. It's the official app from Google Play and hasn't received an update in the last days, so it's very strange that it's now detected. From a description of the same thread (group) I've read the malware should block access to the device. However nothing like this occurred. So is this a false-positive? Edit: Link to this thread sent to ESET labs.