You  wrote:
<snip> 
> lsattr is not installed on my system. 
<snip> 
> chattr not installed on my system either. If it was, I do not know the
<snip> 

It sounds like your system has been cracked badly. The programs  
chattr, lsattr, etc are installed by the e2fsprogs rpm during install.  It
is highly possible that the crackers may be using your box as a filez
server. If the cracker left the original rpm program untouched, and 
if theattributes were not changed on /usr/sbin, you can reinstall the 
programs from the e2fsprogs rpm.

Although you may be able to ferret out knopwn offending cracks 
with the program checkroot (http://www.chkrootkit.org), total 
reformat and reinstall is a better solution, using the latest patches 
to prevent being re-cracked. If the cracker was smart enough to 
remove lsattr and chattr, he/she probably installed some rootkits 
and back doors which may go a little beyond the normal script 
kiddy attack and which will allow reinfection.

regards,

ben 




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