Win.trojan.toa on my MAC

Hello Roberto,

We are sorry for the inconvenience caused.
Was this threat detected by AVG Free Antivirus?
If yes, when you try to remove it do you get any error?

no it was not detected

how can I remove win.trojan.toa on my MAC - using the free version

Hello Roberto,
Thank you for providing the requested information.
We are escalating this issue to our next level support.
They will contact you via email as soon as possible.
Thank you.

Hello Roberto,
Could you please let us know how you found out this threat?
It would be greatful if you can attach the screenshot of the threat detected.
Thank you.

no it was not detected

User-added image

Hello Roberto,

We are sorry for the inconvenience caused.
Was this threat detected by AVG Free Antivirus?
If yes, when you try to remove it do you get any error?

My backup Synology Server tells me this after receiving the TimeMachine Backups from My three Apple MAC PC's. See the attachments (one included and two to follow)User-added image