The security firm ESET noted that Eltima Software company has unknowingly provided an application infected with the OSX trojan.

The Eltima was the victim of a cyber attack. Those who have installed the Elmedia Player software had also downloaded a malicious trojan Proton, which was in the application installation files. The trojan can take control of the victim's device, steal information from browsers like passwords and logins, or the contents of Bitcoin wallet.

After the ESET expert response, malicious software was removed from the application and Eltima servers. At risk were the owners of macOS devices.

If anyone has downloaded and installed Elmedia Player or Folx by October 19th, he or she ought to scan the system with updated antivirus program for any signs of infection.  However, according to the ESET experts the only effective way to truly disarm the trojan is to reinstall the operating system.