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:
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)?
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.
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.
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
"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.
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!
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?
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
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.
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?
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?
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".
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.
I know this is probably easy and if I only took a while to figure it out maybe I could but I have some stuff that needs to happen soon and I can't figure this out. I was wondering how I could have a log monitor that would email me whenever someone tries to login over ssh to my system. I'm open to everything daemons/scripts or cron itl works as I am not running a production server (but I might be starting that soon). Oh and just a side how do I get sent an email when I get port scanned
Unable to send mail thus adjust protocol port and it worked. Things moving slow on computer. Thus ran clamtk virus scanner. It found a virus. Tried to quarantine it but not successful. Have GUI version 4.15 Antivirus engine .95.3. Virus is located at /home/kim/.mozilla-thunderbird/zrlm4cOj.default/Mail/LocalFolders/Inbox Phishing.Heristics.Email.SpoofedDomain What do I do to get rid of it?
I'm going through the linux hardening checklist, and the only bit I'm having trouble with is how to configure syslogd to email daily reports to my email. my mta is postfix
How do I do this? Or should I ask... where is the HOWTO?
I wanted to know if anyone had an idea or has heard of creating an email alert when a user changes the password on a samba user?I would like to be able to receive and alert if a user changes their samba password. Could anyone point me in the right direction? I will be attempting this on Arch Linux.
I have a mail server that accepts to relay from system in the trusted network. One of the systems in the trusted network is a webserver. On the webserver there are several scripts that send email.Let's focus on the PHP scripts. These use the mail() function for that.I am looking for means to reduce the potential abuse of the mail server when one of the PHP scripts is hacked.For the situation that the code is modified by a hacker or a new script is installed I would like to take this approach:
1) scan the system for scripts using the mail() function 2) generate a checksum list from these scripts 3) intercept email (being sent to sendmail) from these scripts 4) check if they match the checksum list
In theory (I will still have to implement it) this would take care of the situation in which new/modified scripts try to send email.
However, there is also the option of an exploit of some script. Are there any ideas on means to prevent email abuse for this situation (other that: make sure scripts cannot be exploited )?
1. I received an email (spam) on Yahoo Mail from someone who was not intending to send it. (While it did go to spam folder, I did 'open' the email (since it came from a trusted sender) but it only contained a link (which because of WOT) I assumed was spam.) I did NOT click the link.
2. I then informed him that his email addy was spamming.
3 Shortly thereafter, i noticed in Ubuntu (firefox) whenever I clicked "reply" to email back to someone, there was a quick flash of letters/numbers in the slot where I would normally write. This instantly disappears and goes blank so I can write something, so I just figured it was a bug. This is happening on BOTH windows and Ubuntu.
4 Now MY EMAIL is spamming people the people I write to.
So far: I have 1. Changed my Yahoo password 2. Deleted firefox 3. In windows Ran Spybot/Search-Destory AVG (turns up nothing) What else can I do?
