Well if anyone have paypal connected to their steam I advice you to change your paypal password.
If I were someone having problems like this I would
a) Delete all personal information from the account as fast as possible
b) Log off from steam
c) Change the paypal password and the password of the Email related to the steam account.
If you have Email verification enabled you should be able to keep your accounts safe that way. But if those "hackers" really managed to get the servers: Pray and stay off your account.
Do not attempt to change your password or Email now if those "hackers" are good it would make it even worse. Just delete the important information and log off from all accounts related to steam.