Re: process identification

["Ivan Coric" <ivan.coric () workcoverqld com au>]

Hi Stijn,
sounds like the netstat binary has been replaced and possible others, by way of a rootkit.

Try to install lsof (Lists files open by processes), then run #lsof -i
http://www.mandrakelinux.com/en/9.1/features/15.php3

Cheers
Ivan


Ivan Coric, CISSP
IT Technical Security Officer
Information Technology
WorkCover Queensland
Ph: (07) 30066414 Fax: (07) 30066424
Email: ivan.coric () workcoverqld com au

> > > Stijn De Weirdt <stdweird () carl ugent be> 05/03/04 11:49pm >>>
hello, 

i have a computer that has been (succesfully :( ) attacked, and i'm 
currently checking how 'they' did it. the computer has an open port with a listening ftp-server, but there is no 
matching PID with netstat. so here's the question: how do i get the process-id?

some data:
the computer is running some old mandrake version (9.0, kern 2.4.19-16mdk)

'netstat -vapt' output: 
Proto Recv-Q Send-Q Local Address           Foreign Address         State PID/Program name
tcp        0      0 xxx.xxx.xxx:81       *:*                     LISTEN 
-

(denote the last -)

 nmap -p 81 (from another machine) gives
Port       State       Service
81/tcp     filtered    hosts2-ns

but telnet from the same machine gives (partly)
220 xxx.xxx.xxx FTP server (Version 1.8 - 2002/01/14 20:09:00) ready.

the ftp-server seems very highly modified, meaning that
1. there isn't supposed to run one on that computer (but there is one 
installed)
2. doesn't recognise any commands like cd, ls, get,put, login...

currently port 81 is being DROP/LOG via iptables, and i'm reinstalling it in a few days, but any advice on how to look 
for the server process is 
handy. i have root access to the machine, so that's no problem.

many thanks
stijn

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