What are the coolest computer viruses you know and why?

What are the coolest computer viruses you know and why these are the coolest?

I like invisible viruses. Access to a person PC is cool while he/she does not know that I am able to look all the files and stuff on the PC.

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I think the most coolest computer viruses are such what are beneficial for the virus author. Invisible crypto miners are really cool.

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