Just add these to the root .htaccess file

http://www.ipdeny.com/ipblocks/data/countries/my.zone

<Files 403.shtml>
order allow,deny
allow from all
</Files>

#then all the malaysia ips on the above URL

This not stopping the traffic to the server but the IPs will get a 403 - Forbidden 57 bytes?

Blocking entire countries is best done with mod_geoip for Apache2 (Debian) Google for mod_geoip