Desperately need help

[gravitate]

I am currently getting cyber attacked through my wifi. Sombody can connect to my macbook pro and log in as a user account which is apparent by looking at Terminal. Is there anyway I can change the firewall settings at all?

[MHC]

Your computer wil have 2 MAC addresses (at least) one for teh wired Ethernet and one for the WiFi interface.   Have you compare the dubious one against both of them.

[gugaguga]

The fact that they are able to access your MAC means that something is installed there. I would recommend an OS reload here just to make sure.

Then try to run a packet tracer and see if the traffic is still there.