Virus / security / firewall protection software - EX2

Can anyone recommend a compatible virus /security / firewall type software for an EX2 Ultra? Maybe I should be digging deeper but I would have thought that WD would have some form of this software (aside from built in infrastructure)

The Anti-Virus essentials that’s available doesn’t seem to work or maintained (numerous posts on this forum attest to that) . Given the recent articles on ransomware on NAS’s, I wanted to try and protect the content of my NAS better. Unless you are semi cluey on the advance configuring of a NAS (which I am not) there are a lot of variable loopholes / open doors that I may be missing. Thanks.