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Check php for disable_functions
WARNING You should modify the PHP configuration and disable commonly abused php functions, e.g.:
disable_functions = show_source, system, shell_exec, passthru, exec, phpinfo, popen, proc_open, allow_url_fopen
Some client web scripts may break with some of these functions disabled, so you may have to remove them from this list

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Check csf LF_SCRIPT_ALERT option WARNING This option will notify you when a large amount of email is sent from a particular script on the server, helping track down spam scripts
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Check Background Process Killer WARNING You should enable each item in the WHM > Background Process Killer
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و اگه میشه در رابطه با گزینه آخری Background Process یه مقداری توضیح بدید که
BitchX
bnc
eggdrop
generic-sniffers
guardservices
ircd
psyBNC
ptlink
services
کاربردشون چی هست ؟