[CentOS] an actual hacked machine, in a preserved state

Bennett Haselton bennett at peacefire.org
Mon Jan 2 02:03:16 UTC 2012

On Sun, Jan 1, 2012 at 5:01 PM, Les Mikesell <lesmikesell at gmail.com> wrote:

> On Sun, Jan 1, 2012 at 4:23 PM, Bennett Haselton <bennett at peacefire.org>
> wrote:
> >
> > So, following people's suggestions, the machine is disconnected and
> hooked
> > up to a KVM so I can still examine the files.  I've found this file:
> > -rw-r--r-- 1 root root 1358 Oct 21 17:40 /home/file.pl
> > which appears to be a copy of this exploit script:
> > http://archive.cert.uni-stuttgart.de/bugtraq/2006/11/msg00302.html
> > Note the last-mod date of October 21.
> Did you do an rpm -Va to see if any installed files were modified
> besides your own changes?  Even better if you have an old backup that
> you can restore somewhere and run an rsync -avn against the old/new
> instances.

rpm -Va gives:

....L...  c /etc/pam.d/system-auth
S.5....T  c /etc/httpd/conf.d/ssl.conf
SM5...GT  c /etc/squid/squid.conf
S.5....T  c /etc/login.defs
S.5....T  c /etc/ssh/sshd_config
S.5....T  c /etc/httpd/conf.d/welcome.conf
S.5....T  c /etc/httpd/conf/httpd.conf
S.5.....  c /etc/ldap.conf
S.5.....  c /etc/openldap/ldap.conf
....L...  c /etc/pam.d/system-auth
.......T  c /etc/audit/auditd.conf
S.5....T  c /etc/printcap
S.5....T  c /etc/yum/yum-updatesd.conf
S.5.....  c /etc/ldap.conf
S.5.....  c /etc/openldap/ldap.conf

According to
many config files do not verify successfully (and I recognize some of them
from modifying them manually, and others presumably could have been
modified by the hosting company).

I don't have a backup since there is no data stored only on the machine, so
if anything is lost on the machine I just ask the host to re-format it and
then re-upload everything.

> >  Anywhere else that the logs would contain useful data?
> /root/.bash_history might be interesting.  Obviously this would be
> after the fact, but maybe they are trying to repeat the exploit with
> this machine as a base.

Good idea but it only shows the commands that I've run since logging in to
try and find out what happened.  Perhaps the attacker wiped
/root/.bash_history after getting in.

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