Apparent 'Dictionary Attack' On My Server,
Feb 19, 2007
My site is being attacked by what appears to be a dictionary attack on my mail account. They are sending e-mails to random accounts at my domain from random e-mail accounts from somewhere else. Each of their messages is coming from a unique e-mail address and a unique IP address.
Now, we have some dictionary ACL installed that basically blocks any IP address that is caught doing this. So we are blocking tons of IP addresses, but they keep coming at us with new ones. We also have it setup so that the mail is rejected right away for any accounts that aren’t actual e-mail accounts of yours. However, they are hitting the server so hard that it doesn’t seem to be making any difference.
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Sep 14, 2007
RHEL3/Cpanel/Exim
So one of my domains is getting a dictionary attack. It is a popular domain and "big deal" it happens all the time. Well, this time it is the most ruthless distributed dictionary attack I have ever seen.
Today marks the one week period and emails are flooding in 10 to 15 a second (of course none of them ever get delivered). It is like hail pounding on a thin tin roof and the denial/logging alone has the server load at least quadrupled!
Oh yeh, the best part. I have a beautiful list of over 7,000 banned IP addresses (and growing every minute, now THATS DISTRIBUTED!).
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Jan 22, 2008
I have a dual processor, dual core server with 12GB memory.. It uses less than 4% CPU utilization and less than 5% memory utilization, but for some reason It's really slow to load sites...
I know this isn't much information, but would any have any ideas as to what could cause the slow speed?
If is anyone is available to look at it, I'll pay you (obviously).
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Nov 24, 2007
I have to deal with a lot of dictionary attacks. One evening, I got fed up with them and decided to do something about it. So, I wrote a service in VB.NET that monitors the Windows event log. I check for too many incorrect login attempts to MS SQL.
If I find someone attempting to dictionary attack, Windows shows the IP address of the invalid login attempt in the event log. So, I parse the event message, grab the IP address, and use IPSec to block the would-be intruder. Excellent!
Ok. That takes care of SQL attackers. But, what about RDC (Remote Desktops or Terminal Services) attackers? I started using 2x's SecureRDP. It works great, but the logging feature is broken. It doesn't accurately log the attackers' IP addresses. So, how can I get the IP address of those attempting to login via RDC? Anyone know? There has to be a way.
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Jun 27, 2009
I have a dedicated machine collocated at some hosting provider and after a while (14 days or so, but timeframe is not constant) it hangs for no apparent reason. It happened 2 times already. Nothing in the logs (it logs everything), nothing at all.
Before the commission the machine was running for a month without any problems.
The first time it happened the tech guy plugged in monitor and keyboard and could not see anything on the display. Before that machine was not loaded with any traffic, nobody should have actually known it is there (except for some DNS traffic). It took some 20 days of uptime.
The second time it happened was yesterday, after some 15 days of uptime.
I suspect hardware malfunction because I have 2 "identical" (OS & progs, not the hardware) systems running without any problems. It is an HP DL380 G5 machine, the problematic one.
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Apr 2, 2014
PRODUCT, Plesk for Windows VERSION 11.5 latest update VERSION OF MICROUPDATE 11.5.30 Actualizar #39, OPERATING SYSTEM Windows 2008 Server Suddently with no apparent reason, MYSQL stops and Ihave to go to the panel and restart it.
Every Morning I have to restart MySQL thru the control panel in remote console of windows..Works all day long, and then stops at night..Should work as always did, for several months I did not even reboot the server, no I have to reboot the server to see if that fixes the problem. Latest windows update, latest Plesk for windows update, but I have the feeling that with the latest microupdate something has broken,
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Jul 2, 2009
My server is currently underattack, I have been able to keep it up but after I ban 500 IPs, I get a lot of different IPs again.
Any idea or suggestion to do mass-ban to those attacking IPs?
tcp 0 0 xxx.xx.xxx.xxx:80 190.87.128.59:3965 SYN_RECV
tcp 0 0 xxx.xx.xxx.xxx:80 82.115.52.10:2323 SYN_RECV
tcp 0 0 xxx.xx.xxx.xxx:80 90.148.137.56:21094 SYN_RECV
tcp 0 0 xxx.xx.xxx.xxx:80 189.237.35.155:57605 ...
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Jul 4, 2006
Someone is trying to attack our server (I think so). When running apache status there are a LOT of connections from one network, all requesting the same page. But running: netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n does show any of these IP's. So script blocking ddos attacks wont work. Anyone know what can I do about this?
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Aug 22, 2007
I went today to my apache error log, and noticed that those scum lowlifes hackers trying to hack my server every day for at least 100 times!!!
What a disaster!
Examples of urls they trying to use:
- http://usuarios.arnet.com.ar/larry123/safe.txt?
- http://uploaded.justfree.com/id.txt?
- http://nukedclx.info/php/base
Is there anything that can be done to prevent this mor*** from even trying to hack (except putting a bullet in his/their head)?
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Nov 7, 2009
two of my website on the server was changed by the hackers.How did they do it?
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Nov 3, 2009
i got botnet attack my web server...is there anything i can do to block thse attack? my host isnt help much?
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Oct 22, 2009
how to protect an linux dedicated server from bot attack. Im using linux server with cPanel, using CSF firewall + DOS Deflate.
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May 17, 2009
How can check server for dos/ddos/syn attack?
Because my server load is high, perfromance is low, but i dont have any high process.
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Feb 2, 2008
is this DDOs attack : .....
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Jan 31, 2008
I think I'm experiencing some type of alternative to a DDoS attack. My server is being killed by thousands of emails being sent to fake accounts on my server.
I'm not a server administrator, so please bear with me.
My load average is skyrocking to 800.xx at times. I look at "top" and see "exim" for one specific user on my server. I own all the websites on my server, by the way.
When I look at my email queue, I see thousands of emails coming in to accounts that don't exist for that specific user. Let's say the domain name is salcollaziano.com. Somebody is sending spam to various salcollaziano.com aliases that don't exist. Like webmaster -at- salcollaziano.com and suzy -at- salcollaziano.com.
How can I prevent these spam emails from having any interaction with my server? It's causing me a lot of downtime on all the sites I have running on that particular server.
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Nov 27, 2008
Not sure if it's a valid threat, but I would like to do the best I can to identify one as early as possible.
Can someone maybe give me an idea of what to look for? They were not specific on there type of attack, but I was hoping that there was maybe a log file I could tail and keep an eye out for irregularities.
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Aug 8, 2007
my server got phisihing attack with bankamerica/paypal etc. i wounder because we have tight firewall/security etc. but any way this is teribel. i have found ip when look in to /var/log/messages -
its looks like (?@85.201.19.xxx). is it used anonymos ftp? i found same ip used to log in to another ftp host as well.
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Nov 17, 2007
My server (Xeon 3.0Ghz) went down for no reason yesterday and ever since it was rebooted (and I've rebooted a couple of times since then), pages load extremely slowly or just timeout. Server load is constantly hovering around 1 and top stats indicate that the server's resources are not under heavy load, which is contrary to the usual pattern during peak times.
I've checked netstat and I notice a lot of SYN_RECV. Could this be a DoS attack? If so, what steps do I take to stop it?
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Jun 18, 2008
my server is being ddosed and the network utilisation is at 40% of 1gpbs
i asked to softlayer to check and they said my programs/services is taking that much bandwidth
any1 can help me?
if my server is under dos attack wat can i do?
because the bandwidth used is about 50gb/hr
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Jul 7, 2009
My server was hit with flood recently, to the point where I was unable to log in via SSH. Running 'netstat' command showed I was getting flooded with thousands of http requests from China/Saudi Arabia/Korea. I installed APF firewall and added those countries to deny list.
Next day I was hit from Russia and Romania and some others. By reading some posts on this site, on top of APF, I have also installed Dos Deflate. It was working for couple of hours, but then it stopped working. I could not even log in via SSH. My provider told me that APF was using all of the "conntrack" connections. I have increased conntrack connections to 130,000 (I have 4 Gigs of RAM on my server). Is that possible? (I have about 300 IP ranges in my APF deny list).
Next day, I was got hit by different attack: there was 11 Mbps of malicious traffic on average sent to my server. My provider put me behind firewall to mitigate against that kind of attack.
Currently, I am both behind the hardware firewall and I have APF and Dos Deflate running. However my server is not accessible.
When I request, I can log in for couple of minutes, but then I get kicked out.
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Feb 16, 2008
I have been getting ddossed for the last month, my host has tried many things on my server that are commonly suggested around here, however we have over 40 000 connections hitting the server from this attack and it keeps rising.
I am on LiteSpeed.
I also have NetScreen 50 firewall which helped for a little while, however the server still keeps going down.
I am spending $420 a month on my hosting for my dedicated server
Now it is costing me an extra $400 a month to have Netscreen firewall running which is a waste of money as it can not effectively keep the server running and i'm not sure if I can even effectively afford that much money a month, however I might need to spend a little more if need to just get the server running finally.
basically I need some options as to what I can do. I would like to stay with my host, they have been good to me, however if my options are better suited to changing then let me know. I just really need to get my server running great asap and to keep it running great when i'm away from the internet.
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Jun 25, 2008
today i have DDos Attack in my server in port :80
what is the better way to secure my server from DDos Attack
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Feb 23, 2007
OS: Centos 4
Someone managed to get into my server and launched a DoS attack on someone else machine.
How do I find out the person who did this?
How do I find out how the person got in in the first place?
How do I make sure that it cannot happen again using the same method?
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Jan 10, 2007
Today my system which is hosting the site bepenfriends got compramised(win 2k3) and now LT tech guys are working on it to reload the system with a data save. I was not having a hardware firewall which caused this problem. But i had windows firewall, windows malinious software removal tool (defender i haven't installed). I have updated all patches of win2k3 whch was released till today.
Now after restore it will be great work to bring my website back with all those rewritten urls and the softwares and its licenses.
Now please help me out in below stuff.
How to stop further attack and further compramisation of server.
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Jan 6, 2009
I have a client who's server has got DDOS attack. It causes the network disruption and DC wants to turn off the server. My client feels it stupid to turn off the server just like that.
can large attacks prevented server side?
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Jun 18, 2008
Ever since Monday morning, my site has had problems because the server at my host is under attack.
Most of Monday my site was down. Then Monday late afternoon, it came back...I thought. The forum is up and running, but the rest of the site, built on WordPress, is screwy.
Most of the plugins aren't working because of inability to connect with the database.
I can't log in to my cPanel at all and haven't been able to since Sunday.
This is the first time I've experienced anything like this, lasting this long.
It has me wondering if I should start considering a new host. I have loved their service, especially their speedy support (native English speaking to boot) so I hate to leave but I'm not sure if their service is going a little downhill or not.
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Jan 11, 2007
I have a question related DDOS attack. My hosting provider told me that my Server was DDos attacked few days ago. But in those days my server worked fine only apache server was down. The strange fact is that in the same day with this "DDOS attack" one of theyr admins worked something on SSL section of my server and during this operation the SSL hosts were down and httpd worked slow.
Inthe passed 3 months httpd worked very slow and after 2-3 restarts of httpd service the load droped down below 3.00 . I believe theyr httpd service was already with problems and that SSL configuration cause that apache failure in that day with "ddos attack"
I repeat in that day ONLY ssl hosts worked fine and non SSL hosts were down.
It's possibile on DDOS attack that load to be unde 0.5 , SSL hosts to work fine, FTP, Mail and other stuf to work like there is nobody on server (VERY FAST)?
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Sep 22, 2007
on one my root server runs a DDOS attack, apparently from a Botnet, however all have the same Referer. Who can give me Tipps, how I can prevent the attacks? Preferably evenly stop over the Referer?
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Mar 11, 2008
Quote:
Mar 10 20:17:55 host kernel: printk: 102 messages suppressed.
Mar 10 20:17:56 host kernel: printk: 3 messages suppressed.
Mar 10 20:18:01 host kernel: printk: 98 messages suppressed.
Mar 10 20:18:35 host kernel: printk: 34 messages suppressed.
Mar 10 20:18:51 host kernel: printk: 189 messages suppressed.
Mar 10 20:18:56 host kernel: printk: 195 messages suppressed.
Mar 10 20:19:02 host kernel: printk: 249 messages suppressed.
Mar 10 20:19:06 host kernel: printk: 36 messages suppressed.
Mar 10 20:19:21 host kernel: printk: 3 messages suppressed.
Mar 10 20:19:26 host kernel: printk: 342 messages suppressed.
Mar 10 20:19:31 host kernel: printk: 509 messages suppressed.
Mar 10 20:19:47 host kernel: printk: 54 messages suppressed.
Mar 10 20:19:51 host kernel: printk: 421 messages suppressed.
Mar 10 20:19:56 host kernel: printk: 542 messages suppressed.
Mar 10 20:20:01 host kernel: printk: 785 messages suppressed.
Mar 10 20:20:16 host kernel: printk: 340 messages suppressed.
Mar 10 20:20:21 host kernel: printk: 337 messages suppressed.
Mar 10 20:20:26 host kernel: printk: 430 messages suppressed.
Or is this something else? It's been going on for about 40 minutes. I seen my load jump to 20, to 100 and back and fourth
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May 24, 2009
I'm sure that i have Trojans and Viruses on my Server but every time i contacted My Company they ask me to pay money and then they will check and scan my server
so is it any Free application which can scan and remove all bad files on my Server? i'm looking for free applications to scan the whole server
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Jul 18, 2009
My server stop responding, I couldn't access via webmin or ssh, and DNS were not responding, so I have to ask for a reboot and now everything is fine.
Looking at the logs I found this:
Code:
Jul 18 19:23:12 server sshd[18484]: Failed password for root from 61.145.196.117 port 56817 ssh2
Jul 18 19:23:12 server sshd[18485]: Failed password for root from 61.145.196.117 port 60227 ssh2
Jul 18 19:23:13 server sshd[18488]: Failed password for root from 61.145.196.117 port 38038 ssh2
Jul 18 19:23:15 server sshd[18493]: Failed password for root from 61.145.196.117 port 49884 ssh2
Jul 18 19:24:30 server sshd[18497]: Failed password for root from 61.145.196.117 port 37929 ssh2
Jul 18 19:25:06 server sshd[18521]: Did not receive identification string from 61.145.196.117
Jul 18 19:25:09 server sshd[18508]: Did not receive identification string from 61.145.196.117
Jul 18 19:25:14 server sshd[18505]: fatal: Timeout before authentication for UNKNOWN
Jul 18 19:26:00 server sshd[18509]: Did not receive identification string from 61.145.196.117
And searching that IP on google I found it here: http://www.tcc.edu.tw/netbase/net/in...?fun=240&prd=3
And is flagged as a SSH Attack.
Any ideas why my server stopped working? and how to prevent it?
Im using CentOS 5.0
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