Was thinking about this thread as well. So, as far as I could analyze the file I didn't see any network activity from it but also couldn't figure out what it actually does. It was written on Ruby/Go in Jetbrains RubyMine if this can tell you anything lol
The interesting part is that I wasn't able to reproduce the downloading/obtaining process of the file, so couldn't even find out where it comes from. Will try it again some other day.
Definitely looks like a virus, however every way I checked doesn't seem to pick up on what it actually does... Most antiviruses don't see it as a virus either, but any legitimate reason to create Ruby exe in your temp folder on some random occasion? Looks very similar to renpy malware described in the F95 malware thread
One more notice - Microsoft antivirus thinks that it is, in fact, a virus and blocks it, so if this .exe would ever run on your system it would instantly block it, but this did not happen to me, I got a threat notification after my AV decided to go through my filesystem, I know it because it did detect other "virus" (false positive) on my PC some time before finding under_control.exe and long after I stopped messing with the game. So I assume it was never executed for me