Hello Avast gurus. Just tonight started getting threats from: http;//s.vb3k.com/crossdomain.
Can you help? thanks Mike
Attach your basic logs. (MBAM, FRST and aswMBR…!!)
Instructions: https://forum.avast.com/index.php?topic=53253.0
I’m having the same issue but on a mac. Do you guys support that or if not, do you have any recommendations?
Sorry, the tools are Windows only.
ok, thanks.
Miker, ask in the MAC forum for help.
See: Not enough nameserver information was found to test the zone s.vb3k dot com (malformed domain), but an IP address lookup succeeded in spite of that,
while the main domain is OK: http://dnscheck.pingdom.com/?domain=vb3k.com
Errors and warnings: http://mxtoolbox.com/domain/s.vb3k.com/
Error: The underlying connection was closed: An unexpected error occurred on a send. (htxps://vb3k.com)
Warnings should be enough reason for domain to be blacklisted
dns Name Servers are on the Same Subnet & SOA Expire Value out of recommended range
smtp May be an open relay.
smtp - Does not support TLS.
On l.gtld-servers.net that may have their DNS hijacked
http://forum.directadmin.com/archive/index.php/t-43533.html
polonus (volunteer wesite security analyst and website error-hunter)
I’m on mac and have been experiencing this exact issue as well. 
Pondus already answered you here: https://forum.avast.com/index.php?msg=1162978