Hi, I used rkhunter a couple of days ago by running in terminal as root "rkhunter -c --sk" and came up with multiple file warnings, including that there was a key logger installed. I had no indications of a rootkit, and I subsequently ran chkrootkit and it also found no rootkits. I am running Opensuse 10.3 on a hp dv2000 laptop. I had just finished running an update on opensuse and thought that perhaps because I hadn't logged out and back in as a user before I did a rkhunter scan, rkhunter was reading the file changes from the update as something to warn about and giving me a false indication of problems. I then did a "rkhunter --propupdate" and then followed that with "rkhunter -c --sk" Most of the warnings went away, but not all. I decided to wait to see if anyone else was having the warning of a keylogger before I addressed the list to see if something was really gone awry. Here is the current readout, and I disabled ssh root access a long time ago but it always comes up as a warning:
linux-bd31:/home/lxmark # rkhunter -c --sk
[ Rootkit Hunter version 1.3.2 ]
Checking system commands...
Performing 'strings' command checks
Checking 'strings' command [ OK ]
Performing 'shared libraries' checks
Checking for preloading variables [ None found ]
Checking for preload file [ Not found ]
Checking LD_LIBRARY_PATH variable [ Not found ]
Performing file properties checks
Checking for prerequisites [ OK ]
/bin/awk [ OK ]
/bin/basename [ OK ]
/bin/bash [ OK ]
/bin/cat [ OK ]
/bin/chmod [ OK ]
/bin/chown [ OK ]
/bin/cp [ OK ]
/bin/csh [ OK ]
/bin/date [ OK ]
/bin/df [ OK ]
/bin/dmesg [ OK ]
/bin/echo [ OK ]
/bin/ed [ OK ]
/bin/egrep [ OK ]
/bin/fgrep [ OK ]
/bin/fuser [ OK ]
/bin/grep [ OK ]
/bin/ip [ OK ]
/bin/kill [ OK ]
/bin/logger [ OK ]
/bin/login [ OK ]
/bin/ls [ OK ]
/bin/lsmod [ OK ]
/bin/mail [ OK ]
/bin/mktemp [ OK ]
/bin/more [ OK ]
/bin/mount [ OK ]
/bin/mv [ OK ]
/bin/netstat [ OK ]
/bin/ps [ OK ]
/bin/pwd [ OK ]
/bin/rpm [ OK ]
/bin/sed [ OK ]
/bin/sh [ OK ]
/bin/sort [ OK ]
/bin/su [ OK ]
/bin/touch [ OK ]
/bin/uname [ OK ]
/bin/gawk [ OK ]
/bin/tcsh [ OK ]
/usr/bin/awk [ OK ]
/usr/bin/basename [ OK ]
/usr/bin/chattr [ OK ]
/usr/bin/chroot [ OK ]
/usr/bin/csh [ OK ]
/usr/bin/curl [ OK ]
/usr/bin/cut [ OK ]
/usr/bin/diff [ OK ]
/usr/bin/dirname [ OK ]
/usr/bin/du [ OK ]
/usr/bin/ed [ OK ]
/usr/bin/egrep [ OK ]
/usr/bin/env [ OK ]
/usr/bin/fgrep [ OK ]
/usr/bin/file [ OK ]
/usr/bin/find [ OK ]
/usr/bin/grep [ OK ]
/usr/bin/groups [ Warning ]
/usr/bin/head [ OK ]
/usr/bin/id [ OK ]
/usr/bin/killall [ OK ]
/usr/bin/last [ OK ]
/usr/bin/lastlog [ OK ]
/usr/bin/ldd [ Warning ]
/usr/bin/less [ OK ]
/usr/bin/lsattr [ OK ]
/usr/bin/lsof [ OK ]
/usr/bin/lynx [ OK ]
/usr/bin/mail [ OK ]
/usr/bin/md5sum [ OK ]
/usr/bin/newgrp [ OK ]
/usr/bin/passwd [ OK ]
/usr/bin/perl [ OK ]
/usr/bin/pstree [ OK ]
/usr/bin/readlink [ OK ]
/usr/bin/sed [ OK ]
/usr/bin/sh [ OK ]
/usr/bin/sha1sum [ OK ]
/usr/bin/size [ OK ]
/usr/bin/sort [ OK ]
/usr/bin/stat [ OK ]
/usr/bin/strace [ OK ]
/usr/bin/strings [ OK ]
/usr/bin/sudo [ OK ]
/usr/bin/tail [ OK ]
/usr/bin/test [ OK ]
/usr/bin/top [ OK ]
/usr/bin/touch [ OK ]
/usr/bin/tr [ OK ]
/usr/bin/uniq [ OK ]
/usr/bin/users [ OK ]
/usr/bin/vmstat [ OK ]
/usr/bin/w [ OK ]
/usr/bin/watch [ OK ]
/usr/bin/wc [ OK ]
/usr/bin/wget [ OK ]
/usr/bin/whatis [ OK ]
/usr/bin/whereis [ OK ]
/usr/bin/which [ OK ]
/usr/bin/who [ OK ]
/usr/bin/whoami [ OK ]
/usr/bin/gawk [ OK ]
/usr/bin/tcsh [ OK ]
/usr/bin/mailx [ OK ]
/sbin/checkproc [ OK ]
/sbin/chkconfig [ Warning ]
/sbin/depmod [ OK ]
/sbin/ifconfig [ OK ]
/sbin/ifdown [ OK ]
/sbin/ifstatus [ OK ]
/sbin/ifup [ Warning ]
/sbin/init [ OK ]
/sbin/insmod [ OK ]
/sbin/ip [ OK ]
/sbin/lsmod [ OK ]
/sbin/modinfo [ OK ]
/sbin/modprobe [ OK ]
/sbin/nologin [ OK ]
/sbin/rmmod [ OK ]
/sbin/runlevel [ OK ]
/sbin/sulogin [ OK ]
/sbin/sysctl [ OK ]
/usr/sbin/cron [ OK ]
/usr/sbin/groupadd [ OK ]
/usr/sbin/groupdel [ OK ]
/usr/sbin/groupmod [ OK ]
/usr/sbin/grpck [ OK ]
/usr/sbin/pwck [ OK ]
/usr/sbin/tcpd [ OK ]
/usr/sbin/useradd [ OK ]
/usr/sbin/userdel [ OK ]
/usr/sbin/usermod [ OK ]
/usr/sbin/vipw [ OK ]
/usr/sbin/xinetd [ OK ]
/usr/local/bin/rkhunter [ OK ]
Checking for rootkits...
Performing check of known rootkit files and directories
55808 Trojan - Variant A [ Not found ]
ADM Worm [ Not found ]
AjaKit Rootkit [ Not found ]
aPa Kit [ Not found ]
Apache Worm [ Not found ]
Ambient (ark) Rootkit [ Not found ]
Balaur Rootkit [ Not found ]
BeastKit Rootkit [ Not found ]
beX2 Rootkit [ Not found ]
BOBKit Rootkit [ Not found ]
CiNIK Worm (Slapper.B variant) [ Not found ]
Danny-Boy's Abuse Kit [ Not found ]
Devil RootKit [ Not found ]
Dica-Kit Rootkit [ Not found ]
Dreams Rootkit [ Not found ]
Duarawkz Rootkit [ Not found ]
Enye LKM [ Not found ]
Flea Linux Rootkit [ Not found ]
FreeBSD Rootkit [ Not found ]
Fuck`it Rootkit [ Not found ]
GasKit Rootkit [ Not found ]
Heroin LKM [ Not found ]
HjC Kit [ Not found ]
ignoKit Rootkit [ Not found ]
ImperalsS-FBRK Rootkit [ Not found ]
Irix Rootkit [ Not found ]
Kitko Rootkit [ Not found ]
Knark Rootkit [ Not found ]
Li0n Worm [ Not found ]
Lockit / LJK2 Rootkit [ Not found ]
Mood-NT Rootkit [ Not found ]
MRK Rootkit [ Not found ]
Ni0 Rootkit [ Not found ]
Ohhara Rootkit [ Not found ]
Optic Kit (Tux) Worm [ Not found ]
Oz Rootkit [ Not found ]
Phalanx Rootkit [ Not found ]
Phalanx Rootkit (strings) [ Not found ]
Portacelo Rootkit [ Not found ]
R3dstorm Toolkit [ Not found ]
RH-Sharpe's Rootkit [ Not found ]
RSHA's Rootkit [ Not found ]
Scalper Worm [ Not found ]
Sebek LKM [ Not found ]
Shutdown Rootkit [ Not found ]
SHV4 Rootkit [ Not found ]
SHV5 Rootkit [ Not found ]
Sin Rootkit [ Not found ]
Slapper Worm [ Not found ]
Sneakin Rootkit [ Not found ]
Suckit Rootkit [ Not found ]
SunOS Rootkit [ Not found ]
SunOS / NSDAP Rootkit [ Not found ]
Superkit Rootkit [ Not found ]
TBD (Telnet BackDoor) [ Not found ]
TeLeKiT Rootkit [ Not found ]
T0rn Rootkit [ Not found ]
Trojanit Kit [ Not found ]
Tuxtendo Rootkit [ Not found ]
URK Rootkit [ Not found ]
VcKit Rootkit [ Not found ]
Volc Rootkit [ Not found ]
X-Org SunOS Rootkit [ Not found ]
zaRwT.KiT Rootkit [ Not found ]
Performing additional rootkit checks
Suckit Rookit additional checks [ OK ]
Checking for possible rootkit files and directories [ None found ]
Checking for possible rootkit strings [ None found ]
Performing malware checks
Checking running processes for suspicious files [ None found ]
Checking for login backdoors [ None found ]
Checking for suspicious directories [ None found ]
Checking for sniffer log files [ None found ]
Performing trojan specific checks
Checking for enabled xinetd services [ None found ]
Performing Linux specific checks
Checking kernel module commands [ OK ]
Checking kernel module names [ OK ]
Checking the network...
Performing check for backdoor ports
Checking for UDP port 2001 [ Not found ]
Checking for TCP port 2006 [ Not found ]
Checking for TCP port 2128 [ Not found ]
Checking for TCP port 14856 [ Not found ]
Checking for TCP port 47107 [ Not found ]
Checking for TCP port 60922 [ Not found ]
Performing checks on the network interfaces
Checking for promiscuous interfaces [ None found ]
Checking the local host...
Performing system boot checks
Checking for local host name [ Found ]
Checking for local startup files [ Found ]
Checking local startup files for malware [ None found ]
Checking system startup files for malware [ None found ]
Performing group and account checks
Checking for passwd file [ Found ]
Checking for root equivalent (UID 0) accounts [ None found ]
Checking for passwordless accounts [ None found ]
Checking for passwd file changes [ None found ]
Checking for group file changes [ None found ]
Checking root account shell history files [ OK ]
Performing system configuration file checks
Checking for SSH configuration file [ Found ]
Checking if SSH root access is allowed [ Warning ]
Checking if SSH protocol v1 is allowed [ Not allowed ]
Checking for running syslog daemon [ Found ]
Checking for syslog configuration file [ Found ]
Checking if syslog remote logging is allowed [ Not allowed ]
Performing filesystem checks
Checking /dev for suspicious file types [ Warning ]
Checking for hidden files and directories [ None found ]
Checking application versions...
Checking version of GnuPG [ OK ]
Checking version of OpenSSL [ OK ]
Checking version of Procmail MTA [ OK ]
Checking version of OpenSSH [ OK ]
System checks summary
=====================
File properties checks...
Files checked: 135
Suspect files: 4
Rootkit checks...
Rootkits checked : 109
Possible rootkits: 0
Applications checks...
Applications checked: 4
Suspect applications: 0
The system checks took: 1 minute and 16 seconds
All results have been written to the logfile (/var/log/rkhunter.log)
One or more warnings have been found while checking the system.
Please check the log file (/var/log/rkhunter.log)
I am requesting your opinion as to whether this was a spurious warning
regarding a keylogger. If someone can tell me how to access the previous log
which showed all the warnings including the keylogger warning, I will post that
if it is pertinent.
Mark
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