.htaccess file changed on multisites

Hi there.

I had some problems with my cloud server with the hosting company and now discovered that a couple of my .htaccess files changes to the below:

RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} ^Baiduspider [NC]
RewriteRule .* - [F]

Any idea what this mean? Its "greek" to me.