Thanks, "Device Support", that rings a bell! Something I don't remember ever seeing before.
Isn't Kirill associated with DriveDX?
Never used that app.
Only 'krill' I know of are tiny crustaceans feed giant whales!!
There might be something about (him) at FB. Not registered there any more. I also found his name mentioned back in Feb, 2016 concerning "SmartReporter" as being a possible part of "DriveDX".
Don't have any of those apps installed that I know of. But that kext could have been a piece of some app I tested some time ago and only now gets 'noticed' by Apple's increasingly sensitive security functions!
Additional info: While scanning with a couple of security detection apps, I opened the Security & Privacy System Pref. Found some additional text at the bottom of the General tab: "System software from developer 'Krill Luzanov' was blocked from loading." An "Allow" button enabled. I assume that my negative response to that option earlier today created the extra text in that pref.
Edit: Turns out I did have Drive Dx installed. Opened it and got a message that I had 4 more runs of the app from my Trial install back in Feb 2019. Apparently, I did not find the app needed and I have now deleted it. It would have been much more helpful if the dialog and/or the Security & Privacy would have mentioned the name of the app rather than the dev's name.