In order to protect against such threats on mobile devices, you are recommended to:

-Always keep regular backups of your important data.
-Make sure that you run an active anti-virus security suite of tools on your machine.
-Avoid downloading apps from unknown sites and third-party app stores.
-Always pay close attention to the permissions requested by an app, even if it is downloaded from an official app store.
-Do not open any email attachments from unknown sources.
-Finally, browse the Internet safely.