Update or a scam

@majcd  If you do not see a notification regarding a software update can check it is genuine by heading to settings,any real software updatates will be shown here.

However if you  have general concerns your Samsung Device automatically  runs Diagnostic checks.   you can Manually check for threats by going to  Device care-Device protection  and running a scan via the Built in McAfee if this is enabled.  can also run scans on the Apps via Settings-Security and Privacy- Device Protection and Google play Protect.

To  give the maximum protection from viruses and malware  keep operating system and Apps up to date, install an Ad Blocker, avoid installing  apps outwith the Galaxy and Google stores  and do not install third party apps from unknown sources.  It is also advisable to use strong passwords/password Manager ,avoid clicking on unfamiliar links on texts/emails and never use unsecure wifi.

Signs of Hacking would include unrecognised messages/calls on your Device/apps on your Device and high Data usage.  problematic apps can be removed in safe Mode. see more information here https://www.samsung.com/Signs of Hacking 

If serious concerns it would be necesary to factory reset and change passwords.

I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.