I am unaware of any antivirus for Chromebooks. Google builds antivirus into the OS, but that doesn’t protect the computer from user error. Last year, I received a similar sounding email from a friend, and I clicked it and input my password. That’s all it wanted. It wanted my password so the hackers could access my email account. When I realized what I’d done, I immediately reset my password. I also use the system where I receive a code by text message to my phone every time I log into my account from a new device. I think this is called 2-step verification. In order to log into my account, a person has to know my password and have my phone to receive the code. Don’t beat yourself up too bad. We all make mistakes. I’m a very careful computer user, but I still revealed my password to a hacker.