Hi all, I have a big problem. 30 minutes ago, my Debian ISPConfig server decided to just 'hang', all services I had ports forwarded for we're not available any more (I was not at home at the moment it happened, I connected to apache remotely. and it didnt return anything, firefox just kept loading). So I tried to use telnet to connect to ports 80, 143 and 25. I could not get connected at any of these ports. Once I was home I connected to SSH by using one of my other machines.I could logon, but when I tried to run a command (top) my SSH session hangs. I went upstairs to the server and logged on via the console. But there it already hangs at login. The ISPConfig control panel was also unavailable. It happened to me twice now, and its really irritating because it the primary mailserver for my domain. Once the server was reset everything worked fine again. I checked the logs to see if anything happened, but I see nothing suspicious. The server is a laptop with a 1,8 GHz AMD 64 Processor but runs 32 bit Debian and has 1GB of memory and a 80GB harddrive. Does anyone have any ideas what happened?
Thanks for your reply! The output of RKHunter: Code: [ Rootkit Hunter version 1.3.2 ] Checking rkhunter data files... Checking file mirrors.dat [ No update ] Checking file programs_bad.dat [ No update ] Checking file backdoorports.dat [ No update ] Checking file suspscan.dat [ No update ] Checking file i18n/cn [ No update ] Checking file i18n/en [ No update ] Checking file i18n/zh [ No update ] Checking file i18n/zh.utf8 [ No update ] 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/bash [ OK ] /bin/cat [ OK ] /bin/chmod [ OK ] /bin/chown [ OK ] /bin/cp [ 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/login [ OK ] /bin/ls [ OK ] /bin/lsmod [ OK ] /bin/mktemp [ OK ] /bin/more [ OK ] /bin/mount [ OK ] /bin/mv [ OK ] /bin/netstat [ OK ] /bin/ps [ OK ] /bin/pwd [ OK ] /bin/readlink [ OK ] /bin/sed [ OK ] /bin/sh [ OK ] /bin/su [ OK ] /bin/touch [ OK ] /bin/uname [ OK ] /bin/which [ OK ] /usr/bin/awk [ Warning ] /usr/bin/basename [ OK ] /usr/bin/chattr [ OK ] /usr/bin/cut [ OK ] /usr/bin/diff [ OK ] /usr/bin/dirname [ OK ] /usr/bin/dpkg [ OK ] /usr/bin/dpkg-query [ OK ] /usr/bin/du [ OK ] /usr/bin/env [ OK ] /usr/bin/file [ OK ] /usr/bin/find [ OK ] /usr/bin/GET [ Warning ] /usr/bin/groups [ OK ] /usr/bin/head [ OK ] /usr/bin/id [ OK ] /usr/bin/killall [ OK ] /usr/bin/last [ OK ] /usr/bin/lastlog [ OK ] /usr/bin/ldd [ OK ] /usr/bin/less [ OK ] /usr/bin/locate [ OK ] /usr/bin/logger [ OK ] /usr/bin/lsattr [ OK ] /usr/bin/lsof [ OK ] /usr/bin/mail [ OK ] /usr/bin/md5sum [ OK ] /usr/bin/mlocate [ OK ] /usr/bin/newgrp [ OK ] /usr/bin/passwd [ OK ] /usr/bin/perl [ OK ] /usr/bin/pstree [ OK ] /usr/bin/rkhunter [ OK ] /usr/bin/runcon [ OK ] /usr/bin/sha1sum [ OK ] /usr/bin/size [ OK ] /usr/bin/sort [ OK ] /usr/bin/stat [ OK ] /usr/bin/strings [ 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 [ Warning ] /usr/bin/lwp-request [ Warning ] /usr/bin/bsd-mailx [ OK ] /usr/bin/w.procps [ OK ] /sbin/depmod [ OK ] /sbin/ifconfig [ OK ] /sbin/ifdown [ OK ] /sbin/ifup [ OK ] /sbin/init [ OK ] /sbin/insmod [ OK ] /sbin/ip [ OK ] /sbin/lsmod [ OK ] /sbin/modinfo [ OK ] /sbin/modprobe [ OK ] /sbin/rmmod [ OK ] /sbin/runlevel [ OK ] /sbin/sulogin [ OK ] /sbin/sysctl [ OK ] /usr/sbin/adduser [ OK ] /usr/sbin/chroot [ OK ] /usr/sbin/cron [ OK ] /usr/sbin/groupadd [ OK ] /usr/sbin/groupdel [ OK ] /usr/sbin/groupmod [ OK ] /usr/sbin/grpck [ OK ] /usr/sbin/inetd [ OK ] /usr/sbin/nologin [ OK ] /usr/sbin/pwck [ OK ] /usr/sbin/rsyslogd [ OK ] /usr/sbin/tcpd [ OK ] /usr/sbin/unhide [ Warning ] /usr/sbin/useradd [ OK ] /usr/sbin/userdel [ OK ] /usr/sbin/usermod [ OK ] /usr/sbin/vipw [ OK ] /usr/sbin/unhide-linux26 [ Warning ] 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 ] mess`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 inetd services [ OK ] Checking for Apache backdoor [ Not 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 [ None found ] Checking for hidden files and directories [ None found ] Checking application versions... Checking version of GnuPG [ OK ] Checking version of OpenSSL [ OK ] Checking version of PHP [ OK ] Checking version of Procmail MTA [ OK ] Checking version of OpenSSH [ OK ] System checks summary ===================== File properties checks... Files checked: 125 Suspect files: 6 Rootkit checks... Rootkits checked : 108 Possible rootkits: 0 Applications checks... Applications checked: 5 Suspect applications: 0 The system checks took: 56 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) As you see, there are a couple of warnings been they have been there since the install of Debian (last thursday). The output of chkrootkit: Code: ROOTDIR is `/' Checking `amd'... not found Checking `basename'... not infected Checking `biff'... not found Checking `chfn'... not infected Checking `chsh'... not infected Checking `cron'... not infected Checking `crontab'... not infected Checking `date'... not infected Checking `du'... not infected Checking `dirname'... not infected Checking `echo'... not infected Checking `egrep'... not infected Checking `env'... not infected Checking `find'... not infected Checking `fingerd'... not found Checking `gpm'... not found Checking `grep'... not infected Checking `hdparm'... not found Checking `su'... not infected Checking `ifconfig'... not infected Checking `inetd'... not tested Checking `inetdconf'... not infected Checking `identd'... not found Checking `init'... not infected Checking `killall'... not infected Checking `ldsopreload'... not infected Checking `login'... not infected Checking `ls'... not infected Checking `lsof'... not infected Checking `mail'... not infected Checking `mingetty'... not found Checking `netstat'... not infected Checking `named'... not found Checking `passwd'... not infected Checking `pidof'... not infected Checking `pop2'... not found Checking `pop3'... not found Checking `ps'... not infected Checking `pstree'... not infected Checking `rpcinfo'... not infected Checking `rlogind'... not found Checking `rshd'... not found Checking `slogin'... not infected Checking `sendmail'... not infected Checking `sshd'... not infected Checking `syslogd'... not tested Checking `tar'... not infected Checking `tcpd'... not infected Checking `tcpdump'... not infected Checking `top'... not infected Checking `telnetd'... not found Checking `timed'... not found Checking `traceroute'... not infected Checking `vdir'... not infected Checking `w'... not infected Checking `write'... not infected Checking `aliens'... no suspect files Searching for sniffer's logs, it may take a while... nothing found Searching for HiDrootkit's default dir... nothing found Searching for t0rn's default files and dirs... nothing found Searching for t0rn's v8 defaults... nothing found Searching for Lion Worm default files and dirs... nothing found Searching for RSHA's default files and dir... nothing found Searching for RH-Sharpe's default files... nothing found Searching for Ambient's rootkit (ark) default files and dirs... nothing found Searching for suspicious files and dirs, it may take a while... /lib/init/rw/.ramfs Searching for LPD Worm files and dirs... nothing found Searching for Ramen Worm files and dirs... nothing found Searching for Maniac files and dirs... nothing found Searching for RK17 files and dirs... nothing found Searching for Ducoci rootkit... nothing found Searching for Adore Worm... nothing found Searching for ShitC Worm... nothing found Searching for Omega Worm... nothing found Searching for Sadmind/IIS Worm... nothing found Searching for MonKit... nothing found Searching for Showtee... nothing found Searching for OpticKit... nothing found Searching for T.R.K... nothing found Searching for Mithra... nothing found Searching for LOC rootkit... nothing found Searching for Romanian rootkit... nothing found Searching for Suckit rootkit... nothing found Searching for Volc rootkit... nothing found Searching for Gold2 rootkit... nothing found Searching for TC2 Worm default files and dirs... nothing found Searching for Anonoying rootkit default files and dirs... nothing found Searching for ZK rootkit default files and dirs... nothing found Searching for ShKit rootkit default files and dirs... nothing found Searching for AjaKit rootkit default files and dirs... nothing found Searching for zaRwT rootkit default files and dirs... nothing found Searching for Madalin rootkit default files... nothing found Searching for Fu rootkit default files... nothing found Searching for ESRK rootkit default files... nothing found Searching for rootedoor... nothing found Searching for ENYELKM rootkit default files... nothing found Searching for common ssh-scanners default files... nothing found Searching for suspect PHP files... nothing found Searching for anomalies in shell history files... nothing found Checking `asp'... not infected Checking `bindshell'... not infected Checking `lkm'... chkproc: nothing detected chkdirs: nothing detected Checking `rexedcs'... not found Checking `sniffer'... eth0: not promisc and no PF_PACKET sockets Checking `w55808'... not infected Checking `wted'... chkwtmp: nothing deleted Checking `scalper'... not infected Checking `slapper'... not infected Checking `z2'... chklastlog: nothing deleted Checking `chkutmp'... The tty of the following user process(es) were not found in /var/run/utmp ! ! RUID PID TTY CMD ! root 3701 tty3 /sbin/getty 38400 tty3 ! root 3703 tty4 /sbin/getty 38400 tty4 ! root 3705 tty5 /sbin/getty 38400 tty5 ! root 3707 tty6 /sbin/getty 38400 tty6 chkutmp: nothing deleted Checking `OSX_RSPLUG'... not infected
5 days ago, I restored my MX settings to their defaults. Now, the server already has aan uptime of 7 days or so, without hanging. I think I am going to add this server to my MX entry again to see if it keeps working or not.
