US court filing via CourtListener RECAP: United States v. Hyok
Kupay Wallet malicious cryptocurrency application · Beginning on or before February 21, 2020
Overt Act No. 27: Beginning on or before February 21, 2020, defendant JON CHANG HYOK and other hackers developed Kupay Wallet, which was purportedly cryptocurrency wallet software, but which was, in reality, a malicious cryptocurrency application. [Case No. 2:20-cr-00614, U.S. District Court for the Central District of California; filing: SEALED INDICTMENT filed as to Jon Chang Hyok]