RE: chkrootkit and LKM?

["Rob Shein" <shoten () starpower net>]

This won't help if it's an LKM...LKM stands for "Linux Kernel Module," which
means that it's not those binaries that are modified.  Instead, an evil
kernel module has probably been loaded, which provides bogus information (as
well as backdoor access), but in a totally different way.   An LKM rootkit
is a bit trickier to find, as standard operating procedures (known good
versions of ps, netstat, etc) don't work.

> -----Original Message-----
> From: Tim Greer [mailto:chatmaster () charter net] 
> Sent: Monday, June 16, 2003 10:34 PM
> To: Janus N. Tøndering; incidents () securityfocus com
> Subject: Re: chkrootkit and LKM?
>
>
> Get a clean install/binary of top, ps, netstat, etc. and 
> check and see if there's any processes in netstat that aren't 
> listed in ps. Look in your init files, etc.
> --
> Regards,
> Tim Greer  chatmaster () charter net
> Server administration, security, programming, consulting.
>
>
> ----- Original Message -----
> From: "Janus N. Tøndering" <janus () bananus dk>
> To: <incidents () securityfocus com>
> Sent: Monday, June 16, 2003 7:59 AM
> Subject: chkrootkit and LKM?
>
>
> Hi
>
> I using a RHL9 as my workstation. A few days ago I downloaded 
> chkrootkit and it consistently gives the same output (>20 
> hidden processes) when checking for LKM rootkit:
>
> Checking `lkm'... You have    38 process hidden for readdir command
> Warning: Possible LKM Trojan installed
>
> This is even after reboots. How can I check if this is 
> actually the work of the LKM? Or any other rootkit for that matter?
>
> Regards,
> Janus N. Tøndering
> --
> Janus N. Tøndering <janus () bananus dk>
>
>
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> Attend the Black Hat Briefings & Training, July 28 - 31 in 
> Las Vegas, the 
> world's premier technical IT security event! 10 tracks, 15 
> training sessions, 
> 1,800 delegates from 30 nations including all of the top 
> experts, from CSO's to 
> "underground" security specialists.  See for yourself what 
> the buzz is about!  
> Early-bird registration ends July 3.  This event will sell 
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----------------------------------------------------------------------------
Attend the Black Hat Briefings & Training, July 28 - 31 in Las Vegas, the
world's premier technical IT security event! 10 tracks, 15 training sessions,
1,800 delegates from 30 nations including all of the top experts, from CSO's to
"underground" security specialists.  See for yourself what the buzz is about!
Early-bird registration ends July 3.  This event will sell out. www.blackhat.com
----------------------------------------------------------------------------