“Discovered late last year, Chrysaor is spyware believed to have been created by NSO Group Technologies, an Israel-based group which specializes in the development and sale of software exploits. It’s thought to be a descendant of the Pegasus spyware previously found on iOS, and made its way onto handsets through apps which weren’t available in the Google Play Store.”
Source: Google details malware that turned Android phones into powerful espionage tools | AndroidAuthority