most virus writers try to mask their identity
There are instances where virus writers reveal their identities.

http://vil.nai.com/vil/content/v_644.htm

On January 5th of any year, the Joshi virus activates. At that time, the virus will hang the system while displaying the message: "type Happy Birthday Joshi" If the system user then types "Happy Birthday Joshi", the system will again be usable.