add in to your .htaccess lines:
RewriteEngine on
RewriteCond %{QUERY_STRING} ^.*(md5|benchmark|union|select|insert|cast|set|declare|drop|update).* [NC]
RewriteRule ^(.*)$ – [F,L]
If you're inventing and pioneering, you have to be willing to be misunderstood for long periods of time
add in to your .htaccess lines:
RewriteEngine on
RewriteCond %{QUERY_STRING} ^.*(md5|benchmark|union|select|insert|cast|set|declare|drop|update).* [NC]
RewriteRule ^(.*)$ – [F,L]