Rogue svchost.exe process stealthily causes high CPU load

[Entheogenic]

Since about a few weeks ago I noticed that when I leave my PC idle, and if I don't press any key or use the mouse for about 20 to 30 minutes, some rogue svchost.exe process will start utilizing about 20-40% of CPU resources.

As soon as I move the mouse pointer or press any key (which is necessary if I'm to find out which process it is), that process seems to vanish completely and the CPU load goes back to normal.

I tried to locate which particular svchost.exe file it is by leaving sysinternals process explorer running (I hoped to find out its PID) but it seems that even its PID gets changed from one time to another. It seems that the process not only stops using a lot of CPU resources when the PC is not idle anymore, but that it completely stops running.

I ran ESET Smart Security 8 several times and it doesn't find anything suspicious.

Does anyone have some suggestions as to how I could locate the problematic process and hopefully get rid of it once and for all?

 

[Layback Bear]

Just some ideas.

Check if you have anything Scheduled.
Check and see if you have your security System to scan.
Check and see if indexing is completed.
Check and see if you have MRT running.
Check and see if you have any Auto Updating programs.
Do you have any Auto Cloud backup programs running

I would also recommend running Malwarebytes to be sure.

https://www.malwarebytes.org/lp/lp4/02_r/?gclid=CKPTwdfK4sMCFYI_aQodaw4AWw

 

[Entheogenic]

It seems that it was Window's indexing service. Since I turned it off it hasn't occured again.

Thank you so much!

 

[Layback Bear]

I would suggest turning Indexing back on and allow it to complete indexing. I will take some time. It all depends on the system and how much data you have.
Once that is done you should not have a problem. Indexing will be able to keep up with your system without using a lot of resources.