Ubuntu Security :: Interpret The 'dates' In Rkhunter.log?
Oct 6, 2010
I've got rkhunter installed and regularly do scans immediately before & after updates & if I get warnings about 'file property updates' after the update I use 'rkhunter --propupd' to give me a clean run.I'm about to setup a ubuntu computer for my nan, I want to enable automatic security updates so she doesn't have to do anything to keep her system secure. I was planning on running rkhunter when I go to her house (about once a month) and check the dates in the resulting rkhunter.log warnings with those in the var/log/apt/history.log to see if legitimate updates caused any rkhunter warnings. I've noticed though that the 'Current file modifiation time:' in the rkhunter.log warnings are incorrect.
My system seems to be about 15 days behind the actual date, I've now run rkhunter --propupd so I have no warnings but got this one off another forum post to show what I mean:
Current file modification time: 1283341157 (01-Sep-2010 06:39:17)
I believe that the '1283341157' is the time in some strange format and the date in brackets is what rkhunter thinks it might be in human format.
1) How to interpret the 'strange date format' (1283341157 in the line above)?
2) If there's a way of configuring the date in rkhunter so that they're correct in rkhunter.log?
3) If there's a better way of keeping her system up-to-date & secure, it's her first computer & she's 86 so I think setting up automatic security updates is the way to go, it'll be one less thing to overwhelm her!
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Apr 14, 2010
What the best method is for checking for rootkits? I have heard that it is best not to install and run these programs on the distro itself. Would it be possible to install them on another distro/partition and then use them to check for rootkits on my main partition/distro (Ubuntu)?
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Jul 13, 2011
Just I install the rkhunter tool via apt-get install rkhunter. When I had run the rkhunter check, rkhunter comes with a warning about "GasKit Rootkit", i dont understand what it is
This server is install new last and maby 1 week old, so i don't understand why this happends.
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Jan 11, 2011
You should be running a firewall. I would also periodically check for rootkits with rkhunter and chkrootkit. Antivirus is usually optional, but it depends on your network ... if you have Window$ machines, do use clamav or something.Hope I'm not distorting the thread but just ran rkhunter and got a lot of red warnings, especially worrying seems:
Quote:
Applications checks...
Applications checked: 4
Suspect applications: 3
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Nov 28, 2010
According to the rkhunter home page, rkhunter is tested on Slackware up to version 10.1. Does this mean it is not useful on Slackware 13.1?
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Feb 1, 2011
When I scanned my Ubuntu 10.04 with rkhunter a root kit hunter toolkit, it gave following warning:
Is there something that I have to worry about.
Code:
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Jan 5, 2010
I have just been checking one of my machines with rkhunter and got the following result:
Code:
[17:50:08] Warning: Checking for possible rootkit strings [ Warning ]
[17:50:09] Found string 'hdparm' in file '/etc/init.d/checkroot.sh'. Possible rootkit: Xzibit Rootkit
[17:50:09] Found string 'hdparm' in file '/etc/init.d/bootlogd'. Possible rootkit: Xzibit Rootkit
Using a well known search engine shows that others have come across this before: [URL] I have installed the current version of rkhunter from Debian's Unstable repo,but i still have the same result as above. I now check the rkhunter wiki,which mentions the same problem: [URL]
Quote: Here is an example on my system to remove a false positive for a certain rootkit that hit hdparm.
[Code]....
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Oct 25, 2010
Is this a false positive from rkhunter?
/usr/bin/curl [ Warning ]
/usr/bin/ldd [ Warning ]
Chkrootkit came back ok. Running ClamAV and will only add that here if it finds anything. I just neve remember seeing these before. This is in Ubuntu 10.10
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Dec 23, 2010
Last night I received the classic rkhunter's email with several warnings inside:
Quote:
Warning:
Warning:
Warning:
and so on..
Why rkhunter isn't able to calculate the hash of those files and compare it with the stored one?
Other strange thing: for the "good" file, the hash is often different!
For example, in the last rkhunter.log, /bin/awk is "good".
But:
Quote:
Quote:
So, if the sha1sum is different, why rkhunter tell me that awk is secure?
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Apr 1, 2010
I have been running rkhunter but how do i view the /var/log/rkhunter.log? I have tried using: sudo /var/log/rkhunter.log but all i got was "Command not found?
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Sep 12, 2010
Rkhunter file properties changed
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Nov 8, 2010
I recently ran a rkhunter check and in my log i have found some very odd (to me at least) reports.
/usr/bin/last [ Warning ]
Warning: The file properties have changed:
File: /usr/bin/last
[code]....
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Mar 17, 2011
i get this warning from selinux :
"SELinux is preventing /bin/mailx from append access on the file /var/lib/rkhunter/rkhcronlog.OmRFCZOynG."
I tried to fix it by "# /sbin/restorecon -v /var/lib/rkhunter/rkhcronlog.OmRFCZOynG" as suggested by SELinux but it comes back with another warning, but with a different /rkhcronlog.xxxxxxxxx...
i think its just a way of rkhunter logging issue -. attached here is the actual error message by selinux.
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Feb 16, 2011
Let's say you have a host with some kind of locally installed root kit detector/scanner.
If someone managed to get root access to that box. Wouldn't the first thing to do, before installing a root kit, be to remove any kind root kit detector?
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Aug 10, 2010
I got this warning in the log of rkhunter:Quote:
Checking /dev for suspicious file types [ Warning ]
[13:37:16] Warning: Suspicious file types found in /dev:
[13:37:16] /dev/shm/pulse-shm-43136623: data
[code]....
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Jun 4, 2009
why I can't open this file.
[root@localhost fedora]# gedit /etc/var/log/rkhunter/rkhunter.log No protocol specified (gedit:24869): Gtk-WARNING **: cannot open display: :0.0 [root@localhost fedora]# gedit /var/log/rkhunter/rkhunter.log No protocol specified
There is absolutely no reason why it can't be opened. I opened it just fine earlier and now it won't open up for inspection.
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Jun 15, 2011
I had been receiving a rkhunter warning on my Fedora 14 server for quite some time now. Attempts to fix the error via information from Google searches have failed. I decided to have a look at bugzilla and what do you know, a fix. The warning:
Quote:
[03:29:08] Warning: The SSH and rkhunter configuration options should be the same:
Warning: The SSH and rkhunter configuration options should be the same:
The fix, according to https://bugzilla.redhat.com/show_bug.cgi?id=596775 is to change
PHP Code:
ALLOW_SSH_PROT_V1=2
to
PHP Code:
ALLOW_SSH_PROT_V1=0
I made the change and ran rkhunter again. No more error. I know everyone was wondering about this.
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Apr 20, 2011
I have a server, running Centos 5.5. It runs daily rkhunter and logwatch. From both I get a daily mail.
I have a desktop computer, running Fedora 13 (almost 14...). It runs also a daily rkhunter and logwatch. But I get ONE mail from logwatch, which contains the result of rkhunter.
On the server, I want also only mail from logwatch, containing the rkhunter results. But so far, no luck.
How can I get the rkhunter results in the logwatch mail on my Centos server?
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Mar 8, 2010
Something really nasty happened to my Arch Linux just now and I don't know why. I was switching through Xfwm4 themes when suddenly Kate crashed and brought down X with it. I started X back up, and Xfwm got hung up, I had to switch to another VT and run "killall X". I tried replacing xfwm4 with pekwm (but still with xfce4-panel) in .xinitrc, same thing. I deleted all my Xfce config files and tried again. The mouse didn't even move. The keyboard didn't work, not even the keyboard light would come on and I couldn't switch to another VT. I was forced to use the Reset button and hope it wouldn't ruin my hard drive.
It booted up fine, I purged all xfce4-related packages just in case while still in CLI mode, and I ran "xinit /usr/bin/pekwm" and I got into a working GUI. I closed a window and X froze again! The window's close button just stayed presses after I let go of it! I killed X from another VT. So I installed and ran "rkhunter" form AUR (I wonder why they don't have it in the arch repos, it's so much better that chkrootkit) and it warned that I might have Adore Rootkit. What should I do? If it helps, I recently installed a few packages from the Arch Linux AUR, including "ooc-git", "ooc-gtksourceview-git", "libpng12", and "virtualbox_bin".
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Aug 29, 2009
I like to keep top/htop running rkhunter showed up randomly. I didn't launch this. f11, 2 day old install, fully updated.
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Feb 22, 2011
Like Jackp27, I am reacting to a transient warning from rkhunter, indicating a possible LKM trojan, which may or may not be a false positive. Running chkrootkit and rkhunter repeatedly, including older versions running under live CDs like INSERT, indicated nothing wrong, but two runs of rkhunter running under the possibly compromised system itself did seem to suggest rkhunter thought it might have found elements of trojan code in RAM.
Like Jackp27, I can't give details right now because I do not currently have access to my logs, but I did find one webpage (can't give link because I do not currently have access to my detailed notes) suggesting that rkhunter may have thought it found a signature of the adore trojan in RAM by looking at /proc/kallsymms which is not a file I ordinary look at. I did look at it very closely yesterday, repeatedly, and it seems to be mostly empty, but occasionaly seems to contain what might be a sequence of calls to various kernel modules--- right now I only recall that some had the form ??_guest_? and that x_tables might be involved.
Can anyone give me a rough indication of what /proc/kallsymms is supposed to do, whether it should normally be empty, and when it is not, what kind of lines are supposed to show up in that "file" when I cat it? I also saw something about ?_logdrop? which may have had something to do with with rotating logs (I rebooted several times) rather than a trojan keylogger. But maybe some trojans rotate logs to try to hide their presence?
I know I am not giving enough information--- I hope to come back later with more details after I have managed to access my logs and notes, so feel free to say what kind of details would be most helpful in helping me decide whether or not this was a false positive.
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May 7, 2010
When installing these progs on Lucid it comes with exim4,I noticed this in the terminal output. What has exim4 to do with rkhunter and/or chkrootkit?
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Sep 18, 2010
How do i check for updates to the current version of rkhunter and if possible upgrade to a new version?
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Apr 25, 2011
It looks like I have one hard drive (30 GB) with three partitions, but df says my primary partition is under 9 GB? Shouldn't it be much larger?
Code:
$ sudo fdisk -l
Disk /dev/sda: 30.0 GB, 30020272128 bytes
255 heads, 63 sectors/track, 3649 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0004b8d0 .....
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Jan 21, 2011
Ah, this time you've really screwed it up without covering you traces: F14 does not interpret correctly my (possibly botched up) ACPI tables and HANGS!!! With acpi=off I have to press the power button to switch my desktop off and that is really ANNOYING. Surely the Fedora engineers could have done a better job with this one.
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Mar 21, 2011
i am getting the following errors when i was using iNSPect
[root@localhost iNSpect_4_beta_3]# ./iNSpect -c out.conf -l2 out4.tr
WARNING: packetString in config file not set. Using default of " ".
WARNING: simulationSpeedAtInit in config file not set. Using default of ".01".
WARNING: simulationSpeedMinimum in config file not set. Using default of ".005".
[code].....
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Aug 2, 2010
I am using Linux as my OS and using TOP command to measure the system performance. From the readings using the TOP, I have observed the following
(1) The used memory increase significantly from 7% to 99% over sometimes? Is there a sign of memory leak? Does OS play a part in used memory? Will system performance be affected? Will system crash due to 99% used memory?
(2) What is the difference between Memory Buffers and Cached?
(3) From the readings, it was observed that Buffers readings decrease, whereas Cached readings increase over time.
(5) Should TOP be used to take readings for system performance (memory & CPU usage)? What is the recommended method to take readings?
Whereas, my applications only consume a bit of memory and CPU.
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Feb 25, 2010
I recently bought a Lexmark Interpret S405 printer, and the box says that it's compatible with ubuntu. I downloaded the lexmark-inkjet-09-driver-1.0-1.i386.rpm.sh, which begins installation but gives the error message The installer package is not supported by your native packaging system. The installer will exit. I also downloaded the Linux_S305_E.sh, which doesn't even begin installation. PLEASE HELP, I have two brand new Lexmark printers, (the other being an X5630) and they both refuse to install or i just have no idea how to install them.
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Feb 14, 2010
I have a number of errors captured by SELinux against NetworkManager - text of one of those is below. I'm not really sure how to interpret it
[code]...
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Feb 18, 2010
I access a linux server shell via putty, but many of the keys I use do not translate across, up, down, left and right all are seen as ^[[A, ^[[B, ^[[D and ^[[C; But so is C-up, C-down, C-left and C-right. And enter is seen as C-j (which move down to the next line), and backspace is seen as C-h, which is backwards delete.
How can I stop these keys being translated into other keys (so I can, for example, configure C-h and backspace to perform two different functions) and what's doing this translation (Putty, the kernel, the shell)?
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