Rootkit
Rick Stevens
rstevens at internap.com
Tue Oct 23 22:12:13 UTC 2007
On Wed, 2007-10-24 at 00:02 +0200, Jordi Prats wrote:
> Hi,
> I'm refering that on a dead filesystem witch is the best tool to check
> if there is any rootkit.
"chkrootkit -r /path/to/dead/filesystem" will check a dead filesystem
for most of the common rootkits. It won't find all of them, however.
> I do not want to check listening ports because it would check the wrong
> machine.
You can't check for listening ports unless the system is live. In that
case, you'd use nmap--preferably from a different system or from some
unwritable media so you know you're using an uncompromised version of
nmap.
> Rick Stevens wrote:
> > On Tue, 2007-10-23 at 23:16 +0200, Jordi Prats wrote:
> >> But it does check for some listening ports. There is not a better tool
> >> for that?
> >
> > The best tool for that is nmap (or for the GUI users, nmap-fe).
> >
> >> Maybe a combination of chkrootkit -d with some AV? Any recomendation?
> >>
> >> Thanks,
> >> Jordi
> >>
> >> Dave Burns wrote:
> >>> On 10/22/07, Jordi Prats <jprats at cesca.es> wrote:
> >>>> About this discussion, chkrootkit are for live systems, isn't it?
> >>>> There's any tool to do rootkit analysis on a "dead" system?
> >>>>
> >>>> I'm thinking of check for rootkits on snapshots of the file system of a
> >>>> virtual machine to determine if the running virtual machine is compromised.
> >>>>
> >>> Use -r switch? As long as you can mount the dead system as a (possbily
> >>> ro) filesystem, I don't see why not.
> >>>
> >>> Dave
> >>>
> >>> chkrootkit --help
> >>> Usage: /usr/lib/chkrootkit-0.47/chkrootkit [options] [test ...]
> >>> Options:
> >>> -h show this help and exit
> >>> -V show version information and exit
> >>> -l show available tests and exit
> >>> -d debug
> >>> -q quiet mode
> >>> -x expert mode
> >>> -r dir use dir as the root directory
> >>> -p dir1:dir2:dirN path for the external commands used by chkrootkit
> >>> -n skip NFS mounted dirs
> >>>
> > ----------------------------------------------------------------------
> > - Rick Stevens, Principal Engineer rstevens at internap.com -
> > - CDN Systems, Internap, Inc. http://www.internap.com -
> > - -
> > - When in doubt, mumble. -
> > ----------------------------------------------------------------------
> >
>
----------------------------------------------------------------------
- Rick Stevens, Principal Engineer rstevens at internap.com -
- CDN Systems, Internap, Inc. http://www.internap.com -
- -
- Grabel's Law: 2 is not equal to 3--not even for large values of 2. -
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