On Friday 20 Jun 2008, Thanigairajan murugan wrote:

> I think my root password should be the problem (admin123) which is a
> dict word and crackers has done their job easily.

Welcome to the school of hard knocks.  With such a password, you 
deserved what happened to you.

> They create a user named "oracle" and they create a directory named "
> bot " and some files and some scripts

I hope you have not left the system in this state and online.  Suggest a 
fresh install.

>
> Lesson Learned :
>
> 1)Password should be strong.
> 2)Allow ssh from known ips only.

or hostnames e.g. dyndns services.  make sure the hostname is updated to 
current ip.

> 3)Have to take bare metal backup after installing the system , for
> quick restore 4)Install and monitor any intrusion detection system

Use tripwire/aide to create file signature db and store the db on a ro 
media only.  When compared it will tell you the files touched by the 
intruder.

-- Arun Khan

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