ICloud malware

iCloud server is secured see this article https://support.apple.com/en-in/HT202303

The Mac might be infected if you click on suspicious links , in safari preferences keep all the extensions as off , in users and groups login items as empty .

You might be using some third party softwares / apps in Mac and still unaware of it run etrecheck https://etrecheck.com/

And post the results , even if you create a new user account if a single adware / malware is there in machine it will not go away ( and you will see problem in setting up home page ) , some times root user account is created and in the root user account itself scan the Mac with malwarebytes after the log out from root user account .

Also if safari is corrupted in user library - preferences - delete com.apple.Safari.plist into the trash , restart the Mac and empty the trash again set up the homepage Set your homepage in Safari on Mac - Apple Support

Go to system preferences and click on users and groups open the pad lock by entering admin name and password ( in case if it is an admin account ) , select login items , if you see app select it and click on minus sign to get deleted .

In system preferences itself click on Security and privacy , click on Accessibility then privacy select the suspicious app click on minus sign to get deleted .

Click on finder and search in Applications and download folder .

The next step would be enter in System Library .

Click on Finder , take cursor on top menu bar click on Go - Computer - Macintosh HD - Library

You have to manually search app in some folders where they reside .

1.Application Support

2.Caches

3.LaunchAgents

4.LaunchDaemons

5.Logs

6.PriviledgedHelperTools

7.Startup-items

8.Receipts

9.Preferences - the plist of app is to be removed , if there is com.apple .xxxx .plist it could also be com.apple.xxx.plist

10.Extensions

11.Frameworks

12.internet Plug -ins

13.Input Methods

14.ScriptingAdditions

Then enter in User library macOS Sierra: Library folder

Search in folders

1.Application Support

2.Caches

3.Cookies

4.Safari

5.Logs

6.Saved Application State

7.LaunchAgents

8.Internet Plug -ins

9.Input Methods

10.Preferences - com.apple.xxx.plist .

11.Containers are also to be checked .

Then again click on Finder - Go - Macintosh HD - System - Library - Frameworks - search the app remnants in Framework folder .

Right click on remnants from the above folders and move to the trash bin , restart the computer and empty the trash .

In that case, I'd ask you to submit a customer support ticket with Malwarebytes.

https://support.malwarebytes.com/community/consumer/pages/contact-us

We'll need to get more information from you.

Please use the manual uninstall or Malwarebytes

Safe Finder Uninstall

Safe Finder Uninstall (2)

Safe Finder Uninstall (3)

This problem cannot be on iCloud, they're definitely wrong about that.

Have you tried changing your Safari home page in Safari's preferences? If not, try that now. Malwarebytes will not (and cannot, due to recent changes to Safari) change Safari's home page for you. Also, before doing that, make sure you have restarted your computer following the removal of whatever Malwarebytes detected.