Q: Is my mac being hacked or does it have a virus...?

The last one of the MBP that was claimed to be virus infested turned out to have a battery which had swollen to the point where is was pressing against the bottom of the keyboard and trackpad causing all kinds of wild & wonderful things.

Take it to Apple and get it checked out.

Allan

Remove the useless Norton/Symantec product by following the instructions on either of these pages:

Uninstalling your Norton product for Mac

Removing Symantec programs for Macintosh

If you have a different version of the product, the procedure may be different. Back up all data before making any changes.

There are several possible causes for this issue. Take each of the following steps until it's resolved.

1. Follow the instructions in this support article.

2. Reset the System Management Controller.

3. If you're using a Bluetooth trackpad, investigate potential sources of interference, including USB 3 devices.

4. A swollen battery in a MacBook Pro can impinge on the trackpad from below and cause erratic behavior. If you have trouble clicking the trackpad, this is likely the reason.

5. There's a report that a (possibly defective) Thunderbolt Ethernet adapter can cause the built in trackpad of a MacBook to  behave erratically. If you're using such an adapter, disconnect it and test.

6. There's also a report of erratic cursor movements caused by an external display that was connected but not turned on.

7. If none of the above applies, or if you have good reason to think your computer is being controlled remotely, disconnect it from the network by turning off Wi-Fi and Bluetooth and unplugging the Ethernet cable or USB network device, whichever is applicable. If the cursor movements stop immediately, you should suspect an intrusion.

NEVER install norton on a Mac. They just dont match.

try Avast! or Clamxav.

Linc has given some very good suggestions. There are a few other possibilities mentioned here:

My mouse keeps moving around on its own, as if someone is remotely controlling my Mac!

Hi All,

I had the same problem all these while and i couldn't find a fundamental solutions untill i decided to change a new mouse and the problem is solved.

Best of Luck!