High CPU usage after some idle minutes

[ZhengshengZhu]

I noticed that when I stop using mouse and keyboard, after minutes my CPU usage rises from ~3% to 50%, 8 out of 16 logic processors are running at full frequency. But once I move mouse or press key, CPU usage will drop to normal within ~3 seconds.I try to find which process eats up CPU, I find winver.exe or charmap.exe, both of which are not suspicious. So I suspect that there is a virus calling these system executables to hide itself, that's what I can deduce now. But anti-virus software Huorong doesn't report anything.

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