RE: chkrootkit and LKM?

From: Rob Shein (shoten_at_starpower.net)
Date: 06/18/03

  • Next message: Valdis.Kletnieks_at_vt.edu: "Re: chkrootkit and LKM?" 
    To: "'Tim Greer'" <chatmaster@charter.net>, 'Janus N. Tøndering' <janus@bananus.dk>, <incidents@securityfocus.com>
Date: Wed, 18 Jun 2003 03:47:44 -0400

    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>
    >
    >
    > --------------------------------------------------------------
    > --------------
    > Attend the Black Hat Briefings & Training, July 28 - 31 in
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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
    > --------------------------------------------------------------
    > --------------
    >
    >

    ----------------------------------------------------------------------------
    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
    ----------------------------------------------------------------------------

  • Next message: Valdis.Kletnieks_at_vt.edu: "Re: chkrootkit and LKM?"

    Relevant Pages

    • Re: chkrootkit and LKM?
      ... > Warning: Possible LKM Trojan installed ... Or any other rootkit for that matter? ... installing without booting from it the infected hard disc. ... world's premier technical IT security event! ...
      (Incidents)
    • Re: chkrootkit and LKM?
      ... If possible, do not allow Loadable module support, maybe this can avoid ... future problems with lkm. ... world's premier technical IT security event! ...
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    • Re: chkrootkit finds 94 process hidden for readdir
      ... chkproc: Warning: Possible LKM Trojan installed ... Does LKM stand for "Linux Kernel Module"? ...
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