Hello,
May I please have the benefit of your informed
thoughts?
rkhunter said fifteen files were moved to new
inodes on August 22, 2011.
Which theory best explains it?
1.) UPGRADING PACKAGES
dhcp3-common
dhcp3-client
libfreetype6
libwbclient0
samba-common
smbfs
However, re-installing the packages with
$ rkhunter --propupd
$ apt-get --reinstall --purge install dhcp3-common (bla bla bla ...)
$ rkhunter -c
failed to elicit the warnings.
2.) A HYPERVISOR
The computer is actually a so called "virtual
private server" (VPS), running under a
hypervisor named "Virtuozzo".
Virtuozzo can share files between multiple
VPSes.
Maybe Virtuozzo moved the files.
However support staff at the company hosting
the VPS were unaware of any changes.
3.) A ROOT KIT
The computer seems to have been recently
infected by malicious email, and soon after
the warnings, security updates were recently
released for the following packages
apache2
apache2-doc
apache2-mpm-prefork
apache2-utils
apache2.2-common
Since there's contradictory evidence for the first
two theories, and corroborating evidence for the
third, I'm inclined to think a root kit is more
likely.
What do you think?
Thanks,
Kingsley
Excerpt from rkhunter.log follows:
[02:19:54] /sbin/depmod [ Warning ]
[02:19:54] Warning: The file properties have changed:
[02:19:54] File: /sbin/depmod
[02:19:55] Current inode: 393257589 Stored inode: 915474138
[02:19:57] /sbin/ifconfig [ Warning ]
[02:19:57] Warning: The file properties have changed:
[02:19:58] File: /sbin/ifconfig
[02:19:58] Current inode: 393257670 Stored inode: 915472951
[02:19:59] /sbin/ifdown [ Warning ]
[02:19:59] Warning: The file properties have changed:
[02:19:59] File: /sbin/ifdown
[02:20:00] Current inode: 393257652 Stored inode: 915472971
[02:20:01] /sbin/ifup [ Warning ]
[02:20:01] Warning: The file properties have changed:
[02:20:02] File: /sbin/ifup
[02:20:02] Current inode: 393257695 Stored inode: 915472971
[02:20:03] /sbin/init [ Warning ]
[02:20:04] Warning: The file properties have changed:
[02:20:04] File: /sbin/init
[02:20:05] Current inode: 393257690 Stored inode: 915344399
[02:20:06] /sbin/insmod [ Warning ]
[02:20:06] Warning: The file properties have changed:
[02:20:06] File: /sbin/insmod
[02:20:07] Current inode: 393257620 Stored inode: 915474136
[02:20:08] /sbin/ip [ Warning ]
[02:20:08] Warning: The file properties have changed:
[02:20:08] File: /sbin/ip
[02:20:08] Current inode: 393257586 Stored inode: 915473089
[02:20:10] /sbin/lsmod [ Warning ]
[02:20:10] Warning: The file properties have changed:
[02:20:11] File: /sbin/lsmod
[02:20:11] Current inode: 393257694 Stored inode: 915474169
[02:20:12] /sbin/modinfo [ Warning ]
[02:20:12] Warning: The file properties have changed:
[02:20:13] File: /sbin/modinfo
[02:20:13] Current inode: 393257697 Stored inode: 915474140
[02:20:14] /sbin/modprobe [ Warning ]
[02:20:14] Warning: The file properties have changed:
[02:20:14] File: /sbin/modprobe
[02:20:15] Current inode: 393257704 Stored inode: 915474135
[02:20:17] /sbin/rmmod [ Warning ]
[02:20:17] Warning: The file properties have changed:
[02:20:17] File: /sbin/rmmod
[02:20:17] Current inode: 393257624 Stored inode: 915474137
[02:20:18] /sbin/runlevel [ Warning ]
[02:20:19] Warning: The file properties have changed:
[02:20:19] File: /sbin/runlevel
[02:20:19] Current inode: 393257634 Stored inode: 915344400
[02:20:21] /sbin/sulogin [ Warning ]
[02:20:21] Warning: The file properties have changed:
[02:20:22] File: /sbin/sulogin
[02:20:22] Current inode: 393257611 Stored inode: 915344234
[02:20:23] /sbin/sysctl [ Warning ]
[02:20:23] Warning: The file properties have changed:
[02:20:23] File: /sbin/sysctl
[02:20:24] Current inode: 393257643 Stored inode: 915474596
[02:20:25] /sbin/syslogd [ Warning ]
[02:20:25] Warning: The file properties have changed:
[02:20:26] File: /sbin/syslogd
[02:20:26] Current inode: 393257649 Stored inode: 915669158
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