Unlike apps from the Play Store, Craxs Rat must be sideloaded (installed via APK). To do this, you must enable "Install from Unknown Sources." This is the single most dangerous setting on Android. Once enabled, you are no longer just installing one RAT; you are opening the door for every malware on your device to install automatically.
Craxs Rat is typically distributed through and social engineering: Craxs Rat Download
This paper addresses three core questions: Unlike apps from the Play Store, Craxs Rat