MWB Warning on new IP address for 'safe' executables

[rich86]

This morning MWB on Windows has started presenting 'toast' pop ups warning me about a malicious website via ports 60074 and 52938 at:

239.255.255.250

The related executable is chrome.exe and spotify.exe. I've never had any warning about this address from either executable.

The warning are coming in quite regularly (see log attached).

Below is the whois lookup and I have attached a screenshot of the toast.

Can anybody give any more information on why I am getting this warning?

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/public/whoisinaccuracy/index.xhtml
#


#
# The following results may also be obtained via:
# https://whois.arin.net/rest/nets;q=239.255.255.250?showDetails=true&showARIN=false&showNonArinTopLevelNet=false&ext=netref2
#

NetRange:       224.0.0.0 - 239.255.255.255
CIDR:           224.0.0.0/4
NetName:        MCAST-NET
NetHandle:      NET-224-0-0-0-1
Parent:          ()
NetType:        IANA Special Use
OriginAS:       
Organization:   Internet Assigned Numbers Authority (IANA)
RegDate:        1991-05-22
Updated:        2013-08-30
Comment:        Addresses starting with a number between 224 and 239 are used for IP multicast.  IP multicast is a technology for efficiently sending the same content to multiple destinations.  It is commonly used for distributing financial information and video streams, among other things.
Comment:        
Comment:        A full list of IPv4 multicast assignments can be found at:
Comment:        
Comment:        http://www.iana.org/assignments/multicast-addresses
Comment:        
Comment:        A document describing the policies for assigning multicast addresses can be found at:
Comment:        http://datatracker.ietf.org/doc/rfc5771
Ref:            https://whois.arin.net/rest/net/NET-224-0-0-0-1


OrgName:        Internet Assigned Numbers Authority
OrgId:          IANA
Address:        12025 Waterfront Drive
Address:        Suite 300
City:           Los Angeles
StateProv:      CA
PostalCode:     90292
Country:        US
RegDate:        
Updated:        2012-08-31
Ref:            https://whois.arin.net/rest/org/IANA


OrgTechHandle: IANA-IP-ARIN
OrgTechName:   ICANN
OrgTechPhone:  +1-310-301-5820 
OrgTechEmail:  email@iana.org
OrgTechRef:    https://whois.arin.net/rest/poc/IANA-IP-ARIN

OrgAbuseHandle: IANA-IP-ARIN
OrgAbuseName:   ICANN
OrgAbusePhone:  +1-310-301-5820 
OrgAbuseEmail:  email@iana.org
OrgAbuseRef:    https://whois.arin.net/rest/poc/IANA-IP-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/public/whoisinaccuracy/index.xhtml
#

 

MWB Log.txt

Edited March 2, 2017 by rich86
Added media and port numbers

[MysteryFCM]

This is a false positive and an update is being pushed as I write this, to correct it.