bloquear una URL en .htaccess
RewriteRule ^canada* - [F]


blouear host o diminio o ip
<RequireAll>
    Require all granted
    Require not ip 181.177.141.110
    Require not host amazonaws.com
</RequireAll>



para bloquear textos den la URL

RewriteCond %{QUERY_STRING} (EAIaIQobChMIuILTv-WW-QIVjLd3Ch2scgBeEAQYBSABEgL5R_D_BwE|1111user|111password) [NC]
RewriteRule .* - [F,L]
