Stop spam bots on my server

Avg Bid (USD)
Project Budget (USD)
$750 - $1500

Project Description:
I have Joomla 1.7.3 installed on my server with CPanel. I am constantly fighting a spam bot that somehow always finds a way to upload a malicious php file that, when called, sends spam using my domain name.
I am looking for a linux admin guru that can fix these issues and secure my sever as soon as possible.
Please note, I cannot upgrade Joomla 1.7.3 so that is not an option.
Further support may be required in the future.

Skills required:
Joomla, Linux, System Admin
About the employer:
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