In my case, I was watching it happen in real time and unable to do anything. I had 2 factor authentication enabled for my wallet. I got an email from the authy app stating that my account had been reset and to click the link to verify it and that if I had not done that to ignore the email. I had not done anything so I ignored the email.
And get away from Coinbase. Their response to this situation has been horrible. Through lack of availability when the incident started to the flaws in their system that allows what I am finding to be prevalent hacking, their response is awful. Coinbase is worse than useless. As I speak to others about my experience, I realize that this is a common perception within the community.