Ce funcționează până acum la mine este codul de mai jos în .htaccess:

Cod:
SetEnvIfNoCase Referer semalt.com spammer=yes
SetEnvIfNoCase Referer poker spammer=yes
SetEnvIfNoCase Referer darodar.com spambot=yes
SetEnvIfNoCase Referer 7makemoneyonline.com spambot=yes
SetEnvIfNoCase Referer buttons-for-website.com spambot=yes
SetEnvIfNoCase Referer ilovevitaly.com spambot=yes
SetEnvIfNoCase Referer ilovevitaly.co spambot=yes
SetEnvIfNoCase Referer semalt.semalt.com spambot=yes
SetEnvIfNoCase referer knowcraftanalytics.com spambot=yes
SetEnvIfNoCase referer priceg.com spambot=yes
SetEnvIfNoCase referer habercim19.com spambot=yes
SetEnvIfNoCase referer sbscnepal.edu.np spambot=yes
SetEnvIfNoCase referer hyc.com.my spambot=yes
SetEnvIfNoCase referer lax1.ib.adnxs.com spambot=yes
SetEnvIfNoCase referer blackhatworth.com spambot=yes

Order allow,deny
Allow from all
Deny from env=spammer