ID:2389064
 
My anti virus program detected and deleted a malware in the latest beta byond version thus deleting the whole byond.exe

Is that normal?

https://imgur.com/a/TII2dCG
This happens every now and then for me as well.

http://www.byond.com/forum/?post=2278727
I forgot exactly how I fixed my issue, I believe I just closed BYOND completely, downloaded the updated installer from the website, then installed as admin.
Oh, I know how to fix it. It's just that this is the first time a malware popped out of byond.
You need to report the false positive to Malwarebytes so they'll stop flagging BYOND files inappropriately. If you don't smack them on the nose with a newspaper they'll never learn.