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I think you're thinking of the Melissa virus https://en.m.wikipedia.org/wiki/Melissa_(computer_virus) which did indeed get tracked back to its author like that.

That's it! Thanks for the reminder.

Not so long ago people were concerned about CPU id. http://courses.ischool.berkeley.edu/i224/s99/GroupJ/whitepap...

There is very little anonymity in the real world in terms of computing at this point. You would have to be extremely careful to truly mask any electronic media being used as any kind of communication platform, online or offline.