It is also known as Keylog-Ardamax. Check it out here: *vil.nai.com/vil/content/v_116785.htm
Its a keylogger btw and will log all your keystrokes....
was this trojan da culprit?
Definitely, it is a keylogger and will log your keystrokes and send it to an email ID. When you used to sign in your Mail, it logged your ID and password and sent it to the person via email who had implanted it on your system. Your passwords were hacked because of this.
I guess Rounit you are using AVG as AVG detects it with the name you posted
PSW.Generic5.ZKD