What is the Nyan Cat virus?

Excuse me, could you elaborate on the Nyan Cat virus? I've heard rumors about it, but I'm not quite sure what it is or how it operates. Is it a malicious software that targets cryptocurrency wallets? Or perhaps it's a joke virus that's harmless but amusing? Could you please provide a clear and concise explanation of what the Nyan Cat virus is, its origins, and any potential risks or consequences associated with it?