RewriteCond %{QUERY_STRING} (?:^|&)wordfence_lh=
RewriteRule ^ /404.php? [R=301,L]
ErrorDocument 404 /404.php
RewriteCond %{QUERY_STRING} (?:^|&)wordfence_lh=
RewriteRule ^ - [R=404,L]
RewriteCond %{QUERY_STRING} (?:^|&)wordfence_lh=
RewriteRule ^ /404.php? [L]