What's the best way to find out if someone has access to my MacBook?

Braxton7803 wrote:

I am going to thank you for helping me with this matter. I could just be freaking out. My new MAC was away longer that I anticipated, I gave way to much access to it.

Do you recommend that I get an anti-virus program? If so, which one?

I'll officially calm down now. Thanks again for your assistance!

I don't see any evidence to suspect you have a issue.

Anti-virus is not recommended, it only seems to cause issues with Macs own built in antivirus/malware detection.

https://www.apple.com/lae/macos/security/

Braxton7803 wrote:

One thing that happened when I received it back was a terminal screen with this message:

Last login: Wed Jan  8 21:37:54 on ttys000

The default interactive shell is now zsh. To update your account to use zsh, please run `chsh -s /bin/zsh`.

For more details, please visit https://support.apple.com/kb/HT208050.

Walters-MacBook-Pro-2020:~ Braxton$ 

And the date was different and this is not the last time I logged into my computer.

That is the standard screen you see when your Mac was upgrade to Catalina—this is normal and does not indicate unauthorized access.

Use zsh as the default shell on your Mac

At least two things would need to be true in order for someone else to have "access" to your Mac:

1. They would need to know your user account and/or Apple ID credentials.
2. They would have to have access to your notebook. Either physical or over a network.

Why do you suspect that someone has tampered with your Mac?

I am assuming that someone else installed Microsoft Office on your Mac ... correct? ... and was this at an Apple Store or an Apple Authorized Service Center ... or somewhere else?

Regardless, if you suspected that they tampered with your Mac, did you change your Apple ID password after they installed this app? If so, what appears to be happening that you still feel that your notebook has been compromised?