Smiley Spam ??

I seem to be getting comment spam that consists just of smileys.
This is typical:
New comment on your post #191 “WordPress Styles”
Author : sdfsdf (IP: 203.213.80.170 , 203-213-80-170-syd-ts12-2600.tpgi.com.au)
E-mail : [email protected]
URI :
Whois : https://ws.arin.net/cgi-bin/whois.pl?queryinput=203.213.80.170
Comment:
:wink::cry::eek::?::!::???::grin::wink::cry::eek::lol::mad::sad::neutral::mrgreen:
IP blocking the way to go on this ?