Process called "ItYoingm" using over 90% CPU and over 106GB memory - root user
Select the process and select the gear icon in Activity Monitor and sample it. You will need to enter your password to allow Activity Monitor to look as root.

The first few lines will establish what this really is...

Analysis of sampling whatever (pid 133) every 1 millisecond
Process:         whatever [133]
Path:            /Library/Application Support/ThisThing/whatever.app/Contents/MacOS/TheDaemon.app/Contents/MacOS/whatever
Load Address:    0x104743000
Identifier:      whatever
Version:         ???
Code Type:       X86-64
Parent Process:  launchd [1]

Date/Time:       2020-03-07 10:44:35.131 -0600
Launch Time:     2020-02-24 10:14:17.221 -0600
OS Version:      Mac OS X 10.15.3 (19D76)
Report Version:  7
Analysis Tool:   /usr/bin/sample


Now to fix it, if you don’t recognize the program you may need help uninstalling it or use a tool like MalwareBytes to scan for known malware.

You can kill just about any root process - worst case it shuts down the system and you need to reinstall macos which doesn’t erase your programs or data, just makes a new operating system.

I would shut down the mac and disconnect from network and power on while you look, it’s likely something you installed, but without details on what you’ve installed we have to make some assumptions. 

While you’re disconnected, making a Time Machine backup or just copying the most important files off your mac to an external drive would be very prudent if you lost control of the system and what’s running as root. Then disconnect that backup until you’re sure you don’t have malware running. (or don't connect your good backup if you know you have one and are already covered - some malware will encrypt files and damage trivial backups that don't make the files read only once backed up in a strong manner)



This last part is pure speculation - since the PID is 176 it started very soon after boot, so it's a persistent program that will likely start each time your Mac is restarted - so you will need to diagnose and fix the launcher or get help if this is all too technical or you want to be sure you've got someone experienced helping.

Good tools:


https://www.malwarebytes.com/
https://objective-see.com/products/knockknock.html
https://www.soma-zone.com/LaunchControl/