/mnt/myname/steam/SteamLibrary/steamapps/common/7 Days To Die/EasyAntiCheat/EasyAntiCheat_Setup.exe: Win.Malware.Generic-9828888-0 FOUND
/mnt/myname/steam/SteamLibrary/steamapps/common/Far Cry 3/bin/pb/pbcls.dll: Win.Virus.Ramnit-9837718-0 FOUND
/mnt/myname/steam/SteamLibrary/steamapps/common/Far Cry 3/bin/pb/dll/wc002312.dll: Win.Virus.Ramnit-9837718-0 FOUND
/mnt/myname/steam/SteamLibrary/steamapps/common/Far Cry 3/bin/pb/pbcl.dll: Win.Virus.Ramnit-9837718-0 FOUND
/mnt/myname/steam/SteamLibrary/steamapps/common/SteamVR/tools/bin/win32/Qt5WebKit.dll: Win.Trojan.Ramnit-5881 FOUND
These, as far as i'm aware, have come straight from steam. I've searched for these online but haven't found anyone else getting the same error.
Far Cry 3 and SteamVR looked to be broken installs i probs copied over from an old device. they weren't even showing up as installed in the steam library, i deleted the folders.
As for 7 days to die, i deleted the EasyAntiCheat_Setup.exe and ran verify integrity of install files. it didn't get redownloaded so i dunno 🤷♂️
The "Last Played" time for it was July 14th 2014, so it's unlikely it has ever run on this machine
There is a change for a cross OS malware but it's probably still quite small.
I would just remove them, and then if they dont re-appear after checking game file consistency then its's mostly likely not a false positive.
But if you know that last playerd is most likely before you installed current OS then it should be clean. I would check user level autostart and cronjob (so mostly stuff in $HOME/.config) places if something didnt get added, go ahead with life.
Unless you are doing banking and other critical stuff on this machine then I would be thinking of hardedning the OS in some way and/or reinstalling.