I’ve installed somehow a program which I have to confess, I somehow felt that something is wrong with it and of course I was right.
how to clean it?
Run adware remove tool, but that was not enough, so I installed https://www.malwarebytes.com/mwb-download/thankyou/ and than VOILA! 202 threats detected :)))
Within thos threats it appears to have found some bitcoinminers -> „Trojan.BitCoinMiner.TskLnk” which I suppose it immediatly started working because my computer just jumped at 90% resource usage :)))
So watch out for those malwares! Good day!