investigators traced clues embedded in the virus itself, culled information from public databases and interviewed Web entrepreneurs to build a case against Parson
http://www.kansascity.com/mld/kansas...ws/6655970.htm

In case you are thinking of testing your skills by writing a virus, it would be wise
to take elementary precautions to make it a little harder for them to trace it
to you. Many people don't realize that documents you create may inadvertantly
carry identifying info from your machine.

It's also not too smart to boast about your exploits.