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Thread: How to get rid of crackers?

  1. #1
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    How to get rid of crackers?

    I've tried installing and reinstalling different versions of linux but I can't seem to get rid of what of one (or several) crackers. I've even used programs like dban and nwipe without success. I'm relatively new to linux, so I really don't know what to think or do. I've also tried HDDerase, but it doesn't seem to work (the hdderase command is not recognized and the version of the program is from 98'; similarly, when I try to install different versions of linux, I always start out with an outdated kernel). When I've been able to install chkrootkit, I've found one, and that's just the tip of the iceberg as far as weird behavior. I'll structure the rest of my post according to the suggestion here: http://ubuntuforums.org/showthread.php?t=1897765. 1. My laptop came with windows 8, but I replaced it entirely with ubuntu (though, whenever I partition, there's /dev/sda (500GB disk space) and /dev/sdb (32GB disk space), and I normally partition the latter as FAT32: not really sure what purpose that serves, but that's what was recommended to me). I don't think my computer is networked with other computers, but again, I'm new to linux. Maybe the output of netstat -tulnp will help:
    root@ubuntu:~# netstat -tulnp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:5900 0.0.0.0:* LISTEN 5715/vino-server tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN 4375/dnsmasq tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 1711/cupsd tcp6 0 0 :::5900 :::* LISTEN 5715/vino-server tcp6 0 0 ::1:631 :::* LISTEN 1711/cupsd tcp6 0 0 :::5800 :::* LISTEN 5715/vino-server udp 0 0 0.0.0.0:59360 0.0.0.0:* 1412/avahi-daemon: udp 0 0 127.0.0.1:53 0.0.0.0:* 4375/dnsmasq udp 0 0 0.0.0.0:68 0.0.0.0:* 4371/dhclient udp 0 0 0.0.0.0:5353 0.0.0.0:* 1412/avahi-daemon: udp6 0 0 :::58010 :::* 1412/avahi-daemon: udp6 0 0 :::5353 :::* 1412/avahi-daemon:
    2. Well, there's the rootkit, the fact that my computer will only run so long after a fresh install before becoming non-functional (for any number of reasons: let me know if I should be more precise), and here's auth.log:
    Apr 11 02:42:34 ubuntu login[1952]: pam_unix(login:session): session opened for user ubuntu by (uid=0) Apr 11 02:42:34 ubuntu login[1948]: pam_unix(login:session): session opened for user ubuntu by (uid=0) Apr 11 02:42:34 ubuntu login[1963]: pam_unix(login:session): session opened for user ubuntu by (uid=0) Apr 11 02:42:34 ubuntu login[1960]: pam_unix(login:session): session opened for user ubuntu by (uid=0) Apr 11 02:42:34 ubuntu login[1961]: pam_unix(login:session): session opened for user ubuntu by (uid=0) Apr 11 02:42:44 ubuntu login[2553]: pam_unix(login:session): session opened for user ubuntu by (uid=0) Apr 11 02:42:46 ubuntu lightdm: pam_unix(lightdm-autologin:session): session opened for user ubuntu by (uid=0) Apr 11 02:42:46 ubuntu lightdm: pam_ck_connector(lightdm-autologin:session): nox11 mode, ignoring PAM_TTY :0 Apr 11 02:43:18 ubuntu polkitd(authority=local): Registered Authentication Agent for unix-session:/org/freedesktop/ConsoleKit/Session7 (system bus name :1.33 [/usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1], object path /org/gnome/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) Apr 11 02:44:07 ubuntu dbus[1394]: [system] Rejected send message, 2 matched rules; type="method_call", sender=":1.52" (uid=999 pid=3583 comm="/usr/lib/indicator-datetime/indicator-datetime-ser") interface="org.freedesktop.DBus.Properties" member="GetAll" error name="(unset)" requested_reply="0" destination=":1.14" (uid=0 pid=2244 comm="/usr/sbin/console-kit-daemon --no-daemon ") Apr 11 02:48:31 ubuntu dbus[1394]: [system] Rejected send message, 2 matched rules; type="method_return", sender=":1.2" (uid=0 pid=1406 comm="/usr/sbin/bluetoothd ") interface="(unset)" member="(unset)" error name="(unset)" requested_reply="0" destination=":1.60" (uid=999 pid=3418 comm="bluetooth-applet ") Apr 11 02:48:46 ubuntu sudo: ubuntu : TTY=pts/0 ; PWD=/home/ubuntu ; USER=root ; COMMAND=/usr/bin/apt-get remove --purge xserver-xorg-core-lts-quantal Apr 11 02:48:46 ubuntu sudo: pam_unix(sudo:session): session opened for user root by ubuntu(uid=999) Apr 11 02:49:13 ubuntu sudo: pam_unix(sudo:session): session closed for user root Apr 11 02:50:21 ubuntu sudo: ubuntu : TTY=pts/0 ; PWD=/home/ubuntu ; USER=root ; COMMAND=/bin/bash Apr 11 02:50:21 ubuntu sudo: pam_unix(sudo:session): session opened for user root by ubuntu(uid=999) Apr 11 03:17:01 ubuntu CRON[5730]: pam_unix(cron:session): session opened for user root by (uid=0) Apr 11 03:17:01 ubuntu CRON[5730]: pam_unix(cron:session): session closed for user root Apr 11 03:25:03 ubuntu sudo: ubuntu : TTY=pts/2 ; PWD=/home/ubuntu ; USER=root ; COMMAND=/bin/bash
    Here's boot.log:
    stdin: error 0 Generating locales... en_US.UTF-8... done Generation complete. pwconv: failed to change the mode of /etc/passwd- to 0600 /usr/lib/python2.7/dist-packages/LanguageSelector/LocaleInfo.py:256: UserWarning: Failed to connect to socket /var/run/dbus/system_bus_socket: No suc$ warnings.warn(msg.args[0].encode('UTF-8')) Using CD-ROM mount point /cdrom/ Identifying.. [d0c57d030ca18c0bb771d2916a23b3e7-2] Scanning disc for index files.. Found 4 package indexes, 0 source indexes, 0 translation indexes and 1 signatures Found label 'Ubuntu 12.04.2 LTS _Precise Pangolin_ - Release amd64 (20130213)' This disc is called: 'Ubuntu 12.04.2 LTS _Precise Pangolin_ - Release amd64 (20130213)' Copying package lists...gpgv: Signature made Wed Feb 13 22:21:17 2013 UTC using DSA key ID FBB75451 gpgv: Good signature from "Ubuntu CD Image Automatic Signing Key " Reading Package Indexes... 0% Reading Package Indexes... 11% Reading Package Indexes... Done Writing new source list Source list entries for this disc are: deb cdrom:[Ubuntu 12.04.2 LTS _Precise Pangolin_ - Release amd64 (20130213)]/ dists/precise/main/binary-i386/ deb cdrom:[Ubuntu 12.04.2 LTS _Precise Pangolin_ - Release amd64 (20130213)]/ dists/precise/restricted/binary-i386/ deb cdrom:[Ubuntu 12.04.2 LTS _Precise Pangolin_ - Release amd64 (20130213)]/ precise main restricted Repeat this process for the rest of the CDs in your set. W: Skipping nonexistent file /cdrom/dists/precise/main/binary-amd64/Packages W: Skipping nonexistent file /cdrom/dists/precise/main/binary-i386/Packages W: Skipping nonexistent file /cdrom/dists/precise/restricted/binary-amd64/Packages W: Skipping nonexistent file /cdrom/dists/precise/restricted/binary-i386/Packages Adding 'diversion of /usr/bin/bluetooth-applet to /usr/bin/bluetooth-applet.orig by casper' * Starting mDNS/DNS-SD daemon^[[164G[ OK ] * Starting load fallback graphics devices^[[164G[ OK ] * Stopping load fallback graphics devices^[[164G[ OK ] * Starting configure network device security^[[164G[ OK ] * Starting Uncomplicated firewall^[[164G[ OK ] * Starting bluetooth daemon^[[164G[ OK ] * Starting Mount network filesystems^[[164G[ OK ] * Starting Failsafe Boot Delay^[[164G[ OK ] * Stopping Mount network filesystems^[[164G[ OK ] * Starting Bridge socket events into upstart^[[164G[ OK ] * Starting CUPS printing spooler/server^[[164G[ OK ] * Stopping Failsafe Boot Delay^[[164G[ OK ] * Starting System V initialisation compatibility^[[164G[ OK ] * Starting set sysctls from /etc/sysctl.conf^[[164G[ OK ] * Starting configure network device security^[[164G[ OK ] * Starting configure network device^[[164G[ OK ] * Stopping set sysctls from /etc/sysctl.conf^[[164G[ OK ] * Starting modem connection manager^[[164G[ OK ] * Stopping load fallback graphics devices^[[164G[ OK ] * Starting configure network device security^[[164G[ OK ] * Starting Uncomplicated firewall^[[164G[ OK ] * Starting bluetooth daemon^[[164G[ OK ] * Starting Mount network filesystems^[[164G[ OK ] * Starting Failsafe Boot Delay^[[164G[ OK ] * Stopping Mount network filesystems^[[164G[ OK ] * Starting Bridge socket events into upstart^[[164G[ OK ] * Starting CUPS printing spooler/server^[[164G[ OK ] * Stopping Failsafe Boot Delay^[[164G[ OK ] * Starting System V initialisation compatibility^[[164G[ OK ] * Starting set sysctls from /etc/sysctl.conf^[[164G[ OK ] * Starting configure network device security^[[164G[ OK ] * Starting configure network device^[[164G[ OK ] * Stopping set sysctls from /etc/sysctl.conf^[[164G[ OK ] * Starting modem connection manager^[[164G[ OK ] * Starting configure network device security^[[164G[ OK ] * Starting configure network device^[[164G[ OK ] * Starting network connection manager^[[164G[ OK ] * Stopping System V initialisation compatibility^[[164G[ OK ] * Starting System V runlevel compatibility^[[164G[ OK ] * Starting restore sound card(s') mixer state(s)^[[164G[ OK ] * Starting ACPI daemon^[[164G[ OK ] * Starting save kernel messages^[[164G[ OK ] * Starting Ubuntu live CD installer^[[164G[ OK ] * Starting automatic crash report generation^[[164G[ OK ] * Starting regular background program processing daemon^[[164G[ OK ] * Starting deferred execution scheduler^[[164G[ OK ] * Stopping Ubuntu live CD installer^[[164G[ OK ] * Starting LightDM Display Manager^[[164G[ OK ] * Starting CPU interrupts balancing daemon^[[164G[ OK ] speech-dispatcher disabled; edit /etc/default/speech-dispatcher * Starting crash report submission daemon^[[164G[ OK ] * Stopping save kernel messages^[[164G[ OK ] * Starting network connection manager^[[164G[ OK ] * Stopping System V initialisation compatibility^[[164G[ OK ] * Starting System V runlevel compatibility^[[164G[ OK ] * Starting restore sound card(s') mixer state(s)^[[164G[ OK ] * Starting ACPI daemon^[[164G[ OK ] * Starting save kernel messages^[[164G[ OK ] * Starting Ubuntu live CD installer^[[164G[ OK ] * Starting automatic crash report generation^[[164G[ OK ] * Starting regular background program processing daemon^[[164G[ OK ] * Starting deferred execution scheduler^[[164G[ OK ] * Stopping Ubuntu live CD installer^[[164G[ OK ] * Starting LightDM Display Manager^[[164G[ OK ] * Starting CPU interrupts balancing daemon^[[164G[ OK ] speech-dispatcher disabled; edit /etc/default/speech-dispatcher * Starting crash report submission daemon^[[164G[ OK ] * Stopping save kernel messages^[[164G[ OK ] saned disabled; edit /etc/default/saned
    I may have botched the ending, so just to be sure it terminates with:
    * Starting configure network device security^[[164G[ OK ] * Starting configure network device^[[164G[ OK ] * Starting network connection manager^[[164G[ OK ] * Stopping System V initialisation compatibility^[[164G[ OK ] * Starting System V runlevel compatibility^[[164G[ OK ] * Starting restore sound card(s') mixer state(s)^[[164G[ OK ] * Starting ACPI daemon^[[164G[ OK ] * Starting save kernel messages^[[164G[ OK ] * Starting Ubuntu live CD installer^[[164G[ OK ] * Starting automatic crash report generation^[[164G[ OK ] * Starting regular background program processing daemon^[[164G[ OK ] * Starting deferred execution scheduler^[[164G[ OK ] * Stopping Ubuntu live CD installer^[[164G[ OK ] * Starting LightDM Display Manager^[[164G[ OK ] * Starting CPU interrupts balancing daemon^[[164G[ OK ] speech-dispatcher disabled; edit /etc/default/speech-dispatcher * Starting crash report submission daemon^[[164G[ OK ] * Stopping save kernel messages^[[164G[ OK ] saned disabled; edit /etc/default/saned
    3. There was some odd behavior on my mom's computer (we're sharing the same, password-protected wifi, but she has a mac): downloads such as hdderase wouldn't complete, the .Trashes folder that macs put on flashdrives contained a lot of strange files (sorry I can't name them: was a while ago), etc. 4. I'm the only user. 5. SSH, VNC, FTP, MySQL, Apache HTTP: all of these services seem to come preinstalled: though, I'm installing ubuntu desktop, not ubuntu server or cloud. 6. I think that my sources are trustworthy: just the standard sources.list fomat, no ppa. 7. Pretty sure it's WPA-protected wifi but will check in the morning. 8. I've been using ufw. Apparmor seems to come preinstalled, but maybe I should look into its configuration. 9. The computer is brand-new, always passes diagnostics tests. 10. The packages that come preinstalled, the presence of a rootkit, the faulty downloads (for instance, trying to install Debian, I get version 4 point something): all repeatable. Happy to provide more info, and thanks!
    Last edited by putStrLnNick; April 14th, 2013 at 01:03 AM.

  2. #2
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    Re: How to get rid of crackers?

    Can you briefly summarize what your problem is?

  3. #3
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    Re: How to get rid of crackers?

    Quote Originally Posted by stinkeye View Post
    Can you briefly summarize what your problem is?
    +1 That would have been nice.
    Also post readable evidence instead of full log dumps with no spaces.

  4. #4
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    Re: How to get rid of crackers?

    Quote Originally Posted by stinkeye View Post
    Can you briefly summarize what your problem is?

    the OP thinks they have a rootkit installed and they do not know how to remove it.

    the op also appears to have 2 disks in the maschine one of which is formatted in FAT32 for no known reason.

    additionally they believe that various server services are installed despite using the desktop edition. which to them it is proof that malware is at work.

    to the OP a.k.a. (putStrLnNick):
    use CODE tags to wrap your logs (icon # in forums post editor).

    Also the logs dont' seem to indicate anything unusual.

    What do you mean by old kernels? Ubuntu doens't use the latest kernel. Arch linux might use it. they are usually for the more adventuorus users.

    What image are you using to install the OS? Have you checked the md5sum after download?
    Easy to understand Ubuntu manual with lots of pics: http://ubuntu-manual.org/
    Do i need antivirus/firewall in linux?
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  5. #5
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    Re: How to get rid of crackers?

    Give me a break. I'm sorry for the poor formatting (it didn't look that way when I typed it out: though perhaps you expect me to know all the notational conventions in my first post); was in a hurry and didn't realize I was violating sacred laws.
    In response to stinkeye, I'm sorry to say that I haven't been able to identify a single core problem. Maybe, it's just a rootkit, in which case I'd appreciate some suggestions about how I might get rid of it. Browsing the forums, I find only reinstallation as a suggested fix, but I've already tried that I'm not sure how many times, which leads me to worry that it's more than a rootkit.
    I've been working on this for a while, and although I've found myself to be the source of some bugs, I simply don't know how to explain the various strange behaviors--all the more strange considered together--in terms of the relatively logical functioning I expect from a brand new computer (two, in fact). So, you want examples: I've tried working with different images (12.04, 12.10, linux mint, debian), and I always seem to get stuck with some kind of restraining packages at the outset. For one install, I'll start out with ubuntu-minimal, which seems to me harmless enough if it weren't that my attempts to install additional packages will very consistently setup replacements (update-alternatives pops up a lot during configuration) that don't always work as expected and tend to be identified as community-maintained by synaptic without me altering any default configurations; or, to take another example, I'll download the latest version of debian, and despite passing the md5 test, the live cd will give me version 4 point something and fail to detect my wifi each time; or, again, whenever I use chkrootkit, it will list users with names like "Suckit" and "FU." Though, I wouldn't use such strong labels as "proof," it's things like this that concern me. Unfortunately, my "belief" that the server services come preinstalled "despite using the desktop edition" appears more than some naive fancy, which strikes me as an odd thing: to mistakenly believe in the presence of something that isn't really there--unless you think I'm delusional. In any case, to the best of my ability, I've observed several samba packages that always seem to accompany fresh installations, and occasionally, I'll get some apache or mysql packages too. But please don't assume that I can't keep track of which packages I've downloaded against others that I take special care to avoid.
    Was unaware that ubuntu doesn't use the latest kernel, thinking that kernels might be os-specific: good to know. I can't help but ask though whether 3.5.0-17, which is what I typically start out with, is normal for quantal?
    I have been checking the md5sums, and mismatches have been rare.

  6. #6
    squakie is offline Chocolate-Covered Ubuntu Beans
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    Re: How to get rid of crackers?

    Let's get this straight to the point: you mention a rootkit - what are the SYMPTOMS that make you think you have one? That's all people are asking - what are the SYMPTOMS? If you're going by the logs which others have already reviewed - I'd trust what they said unless you already know the answer - if so, tell us.

  7. #7
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    Re: How to get rid of crackers?

    Quote Originally Posted by putStrLnNick View Post
    I'm sorry for the poor formatting (it didn't look that way when I typed it out: though perhaps you expect me to know all the notational conventions in my first post); was in a hurry and didn't realize I was violating sacred laws.
    Don't panic! It might seem a bit counter-intuitive at first, but sometimes using [code] and [/code] tags instead of [quote] and [/quote] helps preserve the formatting of quoted log files better.
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  8. #8
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    Re: How to get rid of crackers?

    You could run chkrootkit again and copy and paste the output ( using the code tags)
    That way we'd have a better understanding of what it is your seeing from it.

    I would at this point second and agree with earlier posts that remarked that there seems to be nothing extraordinary or wrong with the contents of the logfiles in post one.
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  9. #9
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    Re: How to get rid of crackers?

    No need to take offence. mastablasta is a regular on these forums and very helpful and welcoming to newcomers. He was not criticizing you but just offering info to better help you post--a "tip", if you will.

    I don't see anything alarming in your logs either. They all look okay to me. If there is something in them that alarms you, please let us know what parts you find alarming. Perhaps we can then explain.

    Having dealt with many newcomers to Linux, it is a common and natural misunderstanding to take some log entries or behaviours for malware. Windows and its accompanying anti-virus industry has so conditioned people to see threats around every corner that many will jump to the conclusion that every behaviour they are unused to or cannot explain is due to a rootkit, a Trojan or a virus. In the case of your examples:

    1. I'm not sure what you mean by restraining packages, but Linux is designed to prevent you from installing things, changing system files or launching certain programs without first expressly elevating your privilege. This restraint is the way the OS is supposed to work and is not the manifestation of a rootkit.

    2. Installing packages into a minimal install will drag in many dependencies because the nature of a minimal install is to initially leave everything out by default. Is this what you mean by "update-alternatives"? Since the phrase "update-alternatives" does not appear in any installation process, please provide actual samples of the output instead of paraphrasing (which we cannot work with).

    3. Linux is not Windows, so most apps will not work like they do in Windows. Is this what you mean by "doesn't work as expected"? If not, please give very specific examples of unexpected behaviours that you are concerned about. That will allow us to either explain them or confirm your fears.

    4. Are these precisely the info that chkrootkit returns? If so, are they part of a larger label? SU is to be expected in Linux distros. And FU or Foo is also a common occurrence.

    @deadflowr is correct. It is always necessary to attach actual output. I would also refer you to this thread which illustrates some common misconceptions about Linux security.

    Most importantly, the following are excellent resources on basic Linux security and well worth the read:

    https://wiki.ubuntu.com/BasicSecurity
    http://www.psychocats.net/ubuntu/security
    https://sites.google.com/site/easyli...oject/security
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  10. #10
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    Re: How to get rid of crackers?

    I think you are being overly paranoid caused mainly by a lack of proper understanding.
    chkrootkit and virus checkers often return false positives.
    eg when chkrootkit is run here...
    Code:
    Searching for Suckit rootkit...                             Warning: /sbin/init INFECTED
    ...and other things like samba being installed.
    Some samba packages are in the default install.... not sure why, possibly for printer sharing.
    Last edited by stinkeye; April 12th, 2013 at 05:12 AM.

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