How can I stop the rootkit hunter false positives?
It is alerting on these, on a fresh OS install:
Checking for prerequisites [ Warning ]
/usr/bin/groups [ Warning ]
/usr/bin/ldd [ Warning ]
/usr/bin/whatis [ Warning ]
/sbin/ifdown [ Warning ]
/sbin/ifup [ Warning ]
Rootkit Hunter version 1.3.2 ]
[1;33mChecking rkhunter version... [0;39m
This version : 1.3.2
Latest version: 1.3.2
[ Rootkit Hunter version 1.3.2 ]
[1;33mChecking rkhunter data files... [0;39m
Checking file mirrors.dat [34C[ [1;32mNo update [0;39m ]
Checking file programs_bad.dat [29C[ [1;32mNo update [0;39m ]
Checking file backdoorports.dat [28C[ [1;32mNo update [0;39m ]
Checking file suspscan.dat [33C[ [1;32mNo update [0;39m ]
Checking file i18n/cn [38C[ [1;32mNo update [0;39m ]
Checking file i18n/en [38C[ [1;32mNo update [0;39m ]
Checking file i18n/zh [38C[ [1;32mNo update [0;39m ]
Checking file i18n/zh.utf8 [33C[ [1;32mNo update [0;39m ]
Warning: Checking for preload file [ Warning ]
Warning: Found library preload file: /etc/ld.so.preload
Warning: The file properties have changed:
File: /bin/ps
Current hash: 36f3d8a9fcaebf5838e5e55ebdcac7e355477343
Stored hash : 8f1acf237e562043f8353f4ec5d0c3490c0d0cb3
Current inode: 1228803 Stored inode: 1228857
Current size: 61364 Stored size: 67088
Current file modification time: 1214487892
Stored file modification time : 1195262225
Warning: The command '/usr/bin/GET' has been replaced by a script: /usr/bin/GET: perl script text executable
Warning: The command '/usr/bin/groups' has been replaced by a script: /usr/bin/groups: Bourne shell script text executable
Warning: The command '/usr/bin/ldd' has been replaced by a script: /usr/bin/ldd: Bourne shell script text executable
Warning: The file properties have changed:
File: /usr/bin/top
Current hash: 15f1f743d73d9546a05a15644816139de7708327
Stored hash : 5e78fb7f0a02643a91964081ca03316dbaf01bdd
Current inode: 246165 Stored inode: 245920
Current size: 48536 Stored size: 48504
Current file modification time: 1214487892
Stored file modification time : 1195262225
Warning: The file properties have changed:
File: /usr/bin/vmstat
Current hash: 898351bc3be226caf6915715b23a1c7cc5d35fdd
Stored hash : edaa64f3921a0a2d873c14a5eb641ba883f4dcff
Current inode: 246561 Stored inode: 246020
Current size: 17872 Stored size: 20444
Current file modification time: 1214487892
Stored file modification time : 1195262225
Warning: The file properties have changed:
File: /usr/bin/w
Current hash: 480c2c2e4f1048e19fc075f4daebe79fa84e08d1
Stored hash : 87f39eeb583bc7f6622e95fd0266f093ed8b362b
Current inode: 246020 Stored inode: 246167
Current size: 9720 Stored size: 11720
Current file modification time: 1214487892
Stored file modification time : 1195262225
Warning: The file properties have changed:
File: /usr/bin/watch
Current inode: 246167 Stored inode: 245924
Current file modification time: 1214487892
Stored file modification time : 1195262225
Warning: The command '/usr/bin/whatis' has been replaced by a script: /usr/bin/whatis: Bourne shell script text executable
Warning: The command '/sbin/ifdown' has been replaced by a script: /sbin/ifdown: Bourne-Again shell script text executable
Warning: The command '/sbin/ifup' has been replaced by a script: /sbin/ifup: Bourne-Again shell script text executable
Warning: The file properties have changed:
File: /sbin/sysctl
Current hash: b560099caf18d28bcc0249efaec75dcddb87b219
Stored hash : fa13202ac5897d9f7198e8afbbe7d0c835b07639
Current inode: 589893 Stored inode: 589875
Current size: 9144 Stored size: 11048
Current file modification time: 1214487892
Stored file modification time : 1195262225
I know some of these warnings like /usr/bin/GET - groups -ldd - whatis - ifdown – ifup are normal false positives.
But other warnings are new,
I think they changed after upgrading the cpanel to 11.23
I have cpanel on centos 4.6
how i can install rootkit hunter on centOs?
and is it different with CHKROOTKIT?
how to correct it?
Code:
---------------------- Start Rootkit Hunter Scan ----------------------
Warning: Checking for prerequisites [ Warning ]
The file of stored file properties (rkhunter.dat) does not exist, and so must be created. To do this type in 'rkhunter --propupd'.
Warning: WARNING! It is the users responsibility to ensure that when the '--propupd' option
is used, all the files on their system are known to be genuine, and installed from a
reliable source. The rkhunter '--check' option will compare the current file properties
against previously stored values, and report if any values differ. However, rkhunter
cannot determine what has caused the change, that is for the user to do.
One or more warnings have been found while checking the system.
Please check the log file (/var/log/rkhunter/rkhunter.log)
I was thinking of getting one of our server admins to install the Rootkit Hunter.
Would this have any effect on our server resources and stability.
Im trying to be more security minded after afew weeks ago when our server was hijacked, and I dont want to go through this again.
How can I get rootkit hunter to email me the results?
I tried
MAILTO=me@mydomain
0 0 * * * /root/rkhunter-1.3.2/files/rkhunter --cronjob
and
MAILTO=me@mydomain 0 0 * * * /root/rkhunter-1.3.2/files/rkhunter --cronjob
But it is not sending the email, nothing even show up in my exim_mainlog.
After few days of not getting even "one" spam out of average 70 messages a day...the company manager got angry! He thought the mail system is down.
Our provider - a VDS subscriber who rent us shared plan for a website - said: we changed nothing. I confirmed: did you install any new anti-spam software on the site...they said: NO.
In a next conversation with the company manager, they told him they installed a new anti-spam software on the whole server and cannot make it off for our site specifically.
The problem is, they already had a kind of anti-spam software which only "marks" spam-like messages with "**SPAM**" in the subject line, and doesn't mark others. I am afraid some customers' emails get marked and deleted with this new software they claim implemented, based on false positives.
Many times I get my emails in Yahoo and Hotmail go to Spam/Junk folder for some not-widely known reasons, like sending to myself, while putting recipients in CC, and other strange reasons like just using CC in an auto-reply!
something any non-tech person might do.
I am thinking in switching to a new host where we only host mails (mx record), so we don't have "any" email deleted without our check.
I was surprised to see that they had 100% uptime in May according to their logs. I am used to see 99.98%, 98.97% etc. etc. with other hosts. But even 100% is quite possible.
On June 7th the uptime suddenly dropped below 96% with avg. 7 outages. I was really disappoined as I was planning to signup. But after a day or so it again rose to 100% with 0 outages on all of their servers which clearly explained the 100% uptime of May.
According to them they had a attack because of which IPs of nodes had to be changed and subsequently they also changed it on hyperspin.com (their server monitoring service). I immediately signed up on hyperspin to verify this claim. Changing the IP or hostname of a monitored service on hyperspin doesn't reset its log is what i clearly observed. Its quite visible that the logs were reset intensionally to hide the actual server uptime and make it always show 100% percent. When i reverted back to them on this issue, they prefered to close the ticket. I just want to know from other hosts, it this practice common or primaryvps.com is an exception? Well as mentioned on their site, the uptime log is located at:
hyperspin.com/publicreport/30037/20077
But don't expect too much. It has only two figures 0 for outages and 100% for uptime.
I don't really know much about how mod_security rules work, I've just clicked on default configuration in WHM.
Anyway one user on our vbulletin board has pmed me saying he can't access the board. He gave me his fixed ip. And I noticed it is in CSF denied ip list as:
lfd: 5 (mod_security) login failures from xx.xx....
I've checked mod_security log and it has like twenty entries for this ip saying: ....
Is there any way to avoid getting false name lookups when trying to resolv inexistent domains ? apart from using another nameserver.
I'm sorry if it was posted earlier, tried searching but it didn't help as it gave me large results.
Code:
[root@removed ~]# ping hjkdji284kajgafhj87da778dfsd.com
PING hjkdji284kajgafhj87da778dfsd..com.insertdchere.com (xx.xxx.xxx.xx) 56(84) bytes of data.
64 bytes from www.insertdchere.com (xx.xxx.xxx.xx): icmp_seq=0 ttl=61 time=1.00 ms
64 bytes from www.insertdchere.com (xx.xxx.xxx.xx): icmp_seq=1 ttl=61 time=0.952 ms
64 bytes from www.insertdchere.com (xx.xxx.xxx.xx): icmp_seq=2 ttl=61 time=1.34 ms
2009/05/19 03:15:01 ossec-rootcheck: No rootcheck_files file: './db/rootkit_files.txt'
2009/05/19 03:15:01 ossec-rootcheck: No rootcheck_trojans file: './db/rootkit_trojans.txt'
How can i 'fix' this?
other options over chkrootkit and rkhunter since they are pretty outdated, and so far have found:
Curuncula:
[url]
Unhide:
[url]
What is a rootkit? The following link is a very good read to answer that question.
http://linux.oreillynet.com/pub/a/li...4/rootkit.html
In Summary, a rootkit is a trojan installed on your Linux server after someone has broken into it. These files are used to cover the hackers tracks, and to give the hacker tools to do more dirty work from your server.
Usage:
1. su - (change to root user)
2. mkdir /usr/local/chkrootkit
3. wget ftp://ftp.pangeia.com.br/pub/seg/pac/chkrootkit.tar.gz
4. tar -xvzf chkrootkit.tar.gz
5. cd chkrootkit*
6. cp * /usr/local/chkrootkit
7. cd /usr/local/chkrootkit
8. make sense
Now scan your system:
1. cd /usr/local/chkrootkit
2. ./chkrootkit
chkrootkit may from time to time give false positives. If you ever get a positive or "infected hit" scan a second time. If you do get a positive hit, google the hit to research the issue and steps to correct.
Part 2 - automated chkrootkit, and emailed results.
I'm lazy, and like my server to do the work for me so I have it scan every day, and email me the results.
Usage:
1. vi /etc/cron.daily/chkrootkit
2. add the following code.
Code:
#!/bin/bash
(cd /usr/local/chkrootkit; ./chkrootkit -q 2>&1 | mail -s "Daily chkrootkt scan" you@yourdomain.com)
3. chmod 0755 /etc/cron.daily/chkrootkit
This will email you@yourdomain.com every morning with your chkrootkit results. the -q option will only show you exploits.
Removal:
If you don't like getting the emails or just want to remove this from your server:
1. rm /etc/cron.daily/chkrootkit
2. rm -rf /usr/local/chkrootkit
All files will now be deleted from your server.
I was following this guide: url]
It's very nice but, 4 years old. So now I am wondering what is best rookit detector, and what is best firewall for centOS 5.
My Windows VPS has come under heavy attack by hackers trying to get through MSFTPSVC for the past month and they finally managed to somehow get in 2 days ago. Somehow, the "Allow anonymous login" setting was selected in my FTP settings and they got in.
They even managed to turn off my firewall. I guessing they used a buffer overflow or some other Windows Server 2003 weakness that was fixed in SP2 (too bad SP2 is'nt supported by SWSoft yet).
The attacks began less than 1 week after I had signed up with Virpus. I did'nt even have my domain name pointing to the server or a site up when the first set of dictionary attacks began. How common is that 0_0 ?
Anyway, since I now know they've gotten in I've run a virus check and everything looks clean but I really want to run some kind of root kit detection software. I've tried everything suggested on the antirootkit website but none of them seem to work on a VPS.
Got this error on rkhunter 1.3.2
Quote:
[12:16:24] /usr/bin/wget [ Warning ]
[12:16:24] Warning: File '/usr/bin/wget' has the immutable-bit set.
Is that a concern? What does it mean?
I tried a little searching both in Google and on here but this is probably going to be a private or member-based thing anyway.
I've gotten a couple comments that some of my outbound personal mail is ending up in spam folders. I think it's almost completely limited to having Outlook (or Express?) as a client... which I assume doesn't even do network-based lookups. Nonetheless I don't seem to be on any blacklists, and running it through my own spamassassin filter comes up basically zero score. But the fact that more than one person has had the problem concerns me greatly. Also, I haven't seen any significant reason why the content itself would trigger anything.
I realize a public spam test service would basically be a "testing ground" for spammers to evade detection, but there's obviously legitimate uses as well... is there such a tool somewhere? Thanks for any advice. Public information sharing is key to a forum, but PMs are welcome in this case.
Being using the free version of siteuptime.com but this month alone i have had so far 3 false alerts reported, i am always in the putty and does not get interrupted, and i am sure i am around on the site too while supposedly siteuptime reports down (i am guessing firewall blocks their server ip for w/e reason). So am wondering is there any really good public tracking site out there which can do public reports more accurately and not kak out on me?
Whats your experience with siteuptime for monitoring if any ? Sometimes it works "ok" other times its just off the charts.
trying to secure my new server that will be opening for shared hosting.
So far I've found:
CHKRootKit, RKHunter, and ClamAV
As for Firewall, I've setup CSF but my question is, what is a good setting for blocking SYN Floods without blocking clients who might be browsing their site and, using DA, and FTP.
In the past I've used:
iptables -A INPUT -p tcp --syn -m limit --limit 1/s --limit-burst 3 -j DROP
iptables -A INPUT -p tcp --syn -m limit --limit 3/s --limit-burst 5 -j DROP
and took down some pretty big attacks, but it was very touchy.
For securities purposes whats best to install?
Feel free to suggest any others.
Server is running cpanel
Every time I log on plesk 11.09 I get an email from admin saying that due to maximum number of failed login attempts for admin, the account was blocked for 30 minutes.
First, I do not get failed login attempts, I log in every time.
Two, the account is not blocked, I can log in, out and back in as many times as I want without problem except that I get this email everytime.
Possible root kit, what can I do?
Sorry for the long post, but I need some feedback.
One of the main reasons that I went from a windows dedicated server to a VPS was because I had several attacks on my server that cost lots of time and money. The only reason to these attacks was that it has to be a root kit in one of the programs I used on my server.
I have used SolarVPS for over 6 months now, and have used most of the same software I used on my dedicated server. I have not had any attacks or somebody gaining access to my VPS.
Last week I got a new Windows VPS from JaguarPC. I installed the same software as always (I will list the software later) and day two of my new VPS somebody had full access, had created a new admin user, installed Utorrent, downloaded and uploaded over 10 GB of movies and music before I discovered the security issue.
Beside my normal software I had downloaded a free downloadmanager, so I could download my plesk backup files faster than on a single download connection. That was the only other software beside my normal software.
But I never used that download manager on my dedicated server, but the same thing happened there also. A user got full access, created a new admin user for remote desktop, etc. I also use different password for the different VPS/DS/hosting plans, but some parts of the main level password is the same.
Last time the user was names support, this time the user was named Dave
I change password often, this year I have changed my password 4-5 times. I have different password for different levels on my VPS/servers. On password for Admin, one for Plesk, one for FTP access to my sites, one for e-mail, one for MySQL etc etc.
I have changed OS at home from XP to Vista, and have only installed 100% secure programs at my home computer. I have not installed one free program or any cracks, warez etc. I also use different antivirus and anti spyware software at home. So the problem can most likely not be at my home computers.
My current software I use on my VPS’s are: (I have some more, but that was the software I used on new VPS)
WinRar 3.61 from [url]
Bandwidth monitor Pro from [url]
Weblog Expert 4.1 from [url]
And the only software I don’t use on my VPS at SolarVPS:
Free Download Manager from [url]
The strange thing is that last time, over 6-7 months ago when I had all the problems with my dedicated server, I traced the IP the hackers had used to login to my DS to Germany.
This time on my new VPS the person has to be from Germany or on country they speak German. The mp3s and the movies where almost all in German.
My plan for the future:
I think I will buy a new VPS plan to test my software. Install one and one software, and see when somebody get access to my VPS. I have to use a provider that offer free OS reloads, so I can reload the OS after I have tested one and one of my programs.
Do anybody know about any companies that allow me to get free OS reloads and provide a Windows 2003 server?
Or will the backup function in VZPP work as OS reload if I take a backup of my new clean VPS and then install software. If it is a rootkit, and I restore, will the rootkit go away? If yes, I can use all providers with VZPP.
And do I have to tell the company what I have planned to do? A rootkit on my VPS will not affect other VPS, so they can get the same rootkit, or the main server?
my DNS stop resolving, once a day i need to restart the service in cpanel/whm , what can be done to prevent that ?
its a fresh vps only cpanel is there and 2 domains with no pages just a simple under costruction index page . in CSF i have a Your Score: 106/112 in security , it firewalled and hardened
right now is using 299 of ram out of 512 burstable to 768
I was wondering if anyone has any methods to stop spammers? Currently i am keeping watch on the mail queue and making sure nothing unsual. I have in WHM configuration setup to not allow more 200 mail messages per account per hour but for some reason it will hit thousands. WHMCS does seem to suspend them automatically or maybe its because of WHM BUT only when its too late.
Any thoughts or suggestions?
Have a persistent spammer who kept emailing my clients, even non existent domain accounts and getting the bounced emails to be send to a particular yahoo address. I tried to block in all ways but can't seem to stop him. His spams are from all over the world. Any suggestions?
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By mistake instead of using gunzip file name on my friend's vps, I had used gunzip -c filename
and its taking hell a lot of time to unzip it, I have no clue on how to stop this and I am scared if I close ssh client, it might be still adding load to the server ..
I am unzipping an 4.5mb file, which on un-compression must be around 14.5mb ..
for the past 10 mins its still unzipping and not sure how long it will go on.. unless I stop it..
a site i manage for a client is being hacked every couple of days, its not the actual site but the hosts server thats getting attacked, all sites on that server, well actually all thier servers.
They have made no attempt to sort this problem, i report it they look at the site and say "site loads fine for us" which it does.
All index files are having a base64 encode line written after the <body> tag, this adds hundreds of spam links which are hidden with display:none; they also add .html to application types in htaccess for php to run in these files too.
Problem is, i am moving the site to another host but cannot change the nameservers to the new host's untill the client returns from a holiday, so i must keep the site up on the insecure host for now.
I am removing the spam code almost daily, is there anyway i can stop this attack happening for the time being, the host does nothing.
I have a server that is sending spam, but I can not know who sent because the server not has installed suphp.
There is another option to see who sends spam?
Is there a way to stop hotlinking? I have a client who has a blog. They have post pics of tattoos. Now there are at least 50 tattoo forums, blogs and other sites hotling to the pics. Now his bandwidth usage has skyrocketed. So enable hotlink protection in his cPanel. Just did a redirect to my main hosting site with a nice please stop hotlink image. Now I see all this in my logs. So I then made a 150 x 9000 clear BG gf with the text at the top please stop hotlinking.
My questions is there any way to stop it. If not should I just make a 1x1 clear gif to redirect to? Also is there a way to not have this traffic show in my log files?
I want to stop emailing myself
I have received quite a few emails from senders claiming to be the recipients [in this case one of my email accounts]. I did not send these emails. This is happening with almost every email account I have setup on one of my domains.
I know this is probably an easy fix-- I am simply unsure of what it is.
I noted that someone else recently posted a similar question-- with only one response. I wanted to see if another post my garner another response.
