What surprises me is that I previously had v2.8.2 and never got a warning or a blocked application by BitDefender.
One can't be too cautious...

Hello

I just downloaded the latest Electrum (v2.9.0 Standalone Executable) from https://electrum.org/#download

BitDefender blocked it as soon as I run the program.

I then uploaded the file to https://www.virustotal.com/en/ and here's the result I got:

https://www.virustotal.com/en/file/98dbe16fefd472b3fb68e2f6e491954cc21ef06cc489588d435b09ab15418f52/analysis/1501271866/

Should I be worried?