Where is the logfile of Avast messages? I had a viruswarning, read ony?

Hi,

I use your great anti-virus software for Mac. Thanks for building this.

I got from a friend a program, which he insisted I would install. I did this.

Then I did an anti-virusscan, and the system told me that there was a read-only file which is harmful, but could not be placed in quarantine, because it was read-only.
I saw this message only once. Then I tried things to see how to solve it, but lost the message, and now I can’t find it any more.

Where can I see the logs of harmful messages like this please, do they have a timestamp?

Thanks for your reply in advance,

Greetings,
Martijn