Using the Steam chat system as the method, this dodgy user has attempted to get my details by posting a fake automated message requesting a username and password.  I usually like to have a bit of fun with these users though the chat it didn’t last long enough for me to get to the punch line.

Steaм Auto-Response System has noticed an issue with multiple logins from this account. To verify you are the true owner, please type your account login name and password here. This message is automated and this account will not respond, but your message will be reviewed by Valve as soon as possible. If no reply is given within the next 24 hours, this account will be deactivated until further notice.
AzzX: where?
Steaм Auto-Response System has noticed an issue with multiple logins from this account. To verify you are the true owner, please type your account login name and password here. This message is automated and this account will not respond, but your message will be reviewed by Valve as soon as possible. If no reply is given within the next 24 hours, this account will be deactivated until further notice.
AzzX: no username password inputs here ????
Steaм Auto-Response System Yes
Steaм Auto-Response System has noticed an issue with multiple logins from this account. To verify you are the true owner, please type your account login name and password here. This message is automated and this account will not respond, but your message will be reviewed by Valve as soon as possible. If no reply is given within the next 24 hours, this account will be deactivated until further notice.
AzzX: no name or password prompt is popping up – must be internet explorer
Steaм Auto-Response System has noticed an issue with multiple logins from this account. To verify you are the true owner, please type your account login name and password here. This message is automated and this account will not respond, but your message will be reviewed by Valve as soon as possible. If no reply is given within the next 24 hours, this account will be deactivated until further notice.
AzzX: It wont let me put a password here – i’ll check
AzzX: Username: resonance cascade Password: •••••••••••••••
AzzX: cut and paste
Steaм Auto-Response System has noticed an issue with multiple logins from this account. To verify you are the true owner, please type your account login name and password here. This message is automated and this account will not respond, but your message will be reviewed by Valve as soon as possible. If no reply is given within the next 24 hours, this account will be deactivated until further notice.
Steaм Auto-Response System We are about to deactivate your account
Steaм Auto-Response System is now Offline.
Steaм Auto-Response System is now Online.
AzzX: I have pasted the details in here
Steaм Auto-Response System type them out.
AzzX: username:  resonance cascade
AzzX: password:  theoretical physicist
Steaм Auto-Response System is now Offline.
Steaм Auto-Response System is now Online.

Remember: Never tell your password to anyone.