How to Block Spam Referrers like darodar.com from Accessing Website?

Question

I have several websites that get daily around 5% of visits from spam referrers. There is one strange things I noticed about this referrers: they show in Google Analytics, bu

Answer 1

I used these mod_rewrite methods for semalt:

RewriteCond %{HTTP_REFERER} ^http(s)?://(www\.)?semalt\.com.*$ [NC]
RewriteCond %{HTTP_REFERER} ^http(s)?://(.*\.)?semalt\.*$ [NC,OR]
RewriteCond %{HTTP_REFERER} ^https?://([^.]+\.)*semalt\.com\ [NC,OR]

or with the .htaccess module mod_setenvif

SetEnvIfNoCase Referer semalt.com spambot=yes
SetEnvIfNoCase REMOTE_ADDR "217\.23\.11\.15" spambot=yes
SetEnvIfNoCase REMOTE_ADDR "217\.23\.7\.144" spambot=yes

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

I even created an Apache, Nginx & Varnish blacklist plus Google Analytics segment to prevent referrer spam traffic, you can find it here:

https://github.com/Stevie-Ray/referrer-spam-blocker/