Security activity has occurred during silent mode

I downloaded a patched game from a website (Nexus forums).  The website is popular and checks for viruses and flagged the file as safe, and many posts claimed it as well, and it fixed the issues with the game.  It scans clean with Norton.  Virus total scans clean with everything except one, which says PE.Heur.InvalidSig.  The forums mentioned this since it's a modified binary.

While playing the game I will regularly minimize the game and go to desktop, browse a website, etc.  Since using this modified patch, when going to desktop, I noticed a few times a message that said "Suspicious Action Blocked - Security activity has occurred during silent mode."  (see attached screenshot) There is nothing to click on or get more information.  When I check Norton's history, there is no mention of this.  I don't have silent mode turned on, but I assume it goes on when playing a fullscreen game.

Is there any way to tell what activity was blocked?  

Thank you.

 

I tried searching online and this forum and still can’t find anything about a message like that during silent mode and how to find out what it blocked. Can anyone help? Thank you.