User blog comment:Hitsuji Mamoru/Servant Creation Room 2 : Guess of the Who/@comment-32599925-20170908002630/@comment-32599925-20170908202210

I guess I was misleading. Sorry about that. She isn't a computer virus, but rather, she's something that can have the same effects as a virus on reality.

In the corruted data in the biography "biohar" is part of "biohazard."

As for being female... she identifies as female, and has her Master see her as female. "Nature" kind of stops being relevant when dealing with this being. She's even modified her own memories and personality after the events of the material (not Type-Moon) where she was an important character.