The ability to hide "Last Seen" or "Blue Ticks" for specific contacts.
APK files from unverified sources often contain spyware or trojans designed to steal banking info or passwords. Download- -com.whatsappx- WhatsApp X 7.2.apk -8...
Often seen on third-party APK sites.
If you have installed com.whatsappx , proceed immediately: The ability to hide "Last Seen" or "Blue