d3adfish

The detection is from Sept 2023 plus we'd been monitoring it for several months before.

A fairly recent detection of MSIL\AVBDiscsoft.A at Hybrid-Analysis: https://www.hybrid-analysis.com/file-collection/651d7f7ee010e723a20317b5 with detailed analysis here: https://www.hybrid-analysis.com/sample/474e3d0c28f53b96ccd885f3b13a35868e1ff572294b89dd2bfa919722081ac0 shows the malware present in DotNetCommon64.dll.
Since this is a file infector, I would say you should at least run sfc /scannow from admin command prompt window to verify no OS files have been tampered with.

It's not ransomware;
https://www.fortiguard.com/encyclopedia/virus/10141333
https://www.trendmicro.com/vinfo/us/security/definition/file-infecting-viruses

Please post a screenshot where ESET flagged the software as ransomware. I'd rather expect it to be detected as a potentially unwanted application. Moreover, the detection name comes from another AV maker as itman pointed out.

As far as DaemonTools goes : https://www.bleepingcomputer.com/forums/t/572079/2-mals-included-with-daemon-tools-install-file-from-disc-soft-website/ .

There may be many people that do that but the percentage for that figure is going to be tiny in comparison to regular users that install once and then never look at the GUI again. It's understandable why they haven't allocated any resources to it. But PC techs will be happy that the GUI remains fairly consistent year on year. Unlike other software companies that insist on changing their GUI every year to make it look like there have been improvements. 

what about the "system startup file check"  that's in "scheduler"?  i have that unchecked. i know that improves boot times. 
 is that really needed after you have run a full scan?