Endpoint Protection Small Business Edition

I've been looking at some forums, but I can't seem to get a handle on how I might resolve this.

I looked at the firewall logs within Endpoint Protection and I saw that there was entry noted with an Asterisk as being spoofed:

I was hoping someone could help me identify the threat...assuming this is a threat as I wouldn't expect anything on our network to have a spoofed address.

Should I be worried about this?  What can I do to prevent this?

Looks to be from multicast. It should show the rule name of what's being blocked in the log. Does it not?

It didn't on the initial report I was looking at, but I did find in another report the rule name:  LLMNR.  Had no idea what that was, but looked it up and you are right.  I really appreciate it.  Thanks for the quick reply and helping out a noobie!

You're welcome.