Filebrowser has malware? Where’s your source for that? I’m using Filebrowser myself, so I’d really like to know more about that.
By the way, are we both talking about this File Browser?

Tried SeaTable? https://seatable.io/en/
This might not be exaxtly what you are looking for as it’s technically not a spreadsheet, and I haven’t tried it out myself. ^___