Malware
HDMR
aka GO-SPORT
HDMR is a ransomware which encrypts user files and adds a .DMR64 extension.
HDMR, also known as GO-SPORT, is a Windows malware family.
Background
HDMR is ransomware that encrypts a user's files and tacks on a .DMR64 extension. It also leaves behind a ransom note titled "!!! READ THIS !!!.hta".
Source: Malpedia (Fraunhofer FKIE).