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Valve suggests that you change your Steam password and keep a close eye on your credit card and bank statements. See our previous story on what to do if you're a victim of a data breach
for more steps you can take to protect your personal information. Now would also be a good time to look at using Steam Guard
. Steam Guard is available to all account holders, and prevents others from accessing Steam from an unknown computer unless you enter a code, which is delivered to your email.
Also, you should make sure your email address is verified with Steam in order to set up security features like secure questions.
To get more tips on keeping your Steam account secure, visit Steamís security page