Strange Http Query Attack

Apr 9, 2009

I have a problem since yesterday in one of my servers, Im receiving between 200 and 300 hits by second from different IPs to a non existent path in a site, the hits are going to different cracks, films and download query's, this site is a directory and its not a warez or p2p site.

The site is onemilliondirectory.com, and I have suspended it because it was using a lot of resources of the first server, now its being redirected to other location, I have placed some traffic trackers to determine the referer or any other usefull info about the visitors, but the referer is always empty and I think that they are fake users because the statcounter tracker do not recognize the visits.

For example, some of the hits are:

Code:
GET /suspended.page/?v=ABC%204%20KIDS%20Workshop%201.0.zip HTTP
GET /suspended.page/?v=DecryptSQL%202.8.zip HTTP/1.1
GET /suspended.page/?v=[0]%20Msn%20Live%20Messenger%20Mobile.zip
GET /inactive.html?v=Able%20Photo%20Slide%20Show%202.2.5.5.zip
GET /suspended.page/?v=English%20Grammar%20Worksheet%201.4.zip
GET /inactive.html?v=Karaoke%205%2030.zip HTTP/1.1
GET /suspended.page/?v=Nero%208%208.3.2.1.zip HTTP/1.1
Detail of one of the visits from the cpanel latest visitors tool:

Code:
Host: 82.246.88.241
/inactive.html?a=Knowing.2009.TS.FRENCH.XVID-PaGlop.****.[emule-island.com].avi
Http Code: 200 Date: Apr 07 16:39:54 Http Version: HTTP/1.1 Size in Bytes: 262
Referer: -
Agent: Internet Explorer

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I don't quite know what to make of this, but I am getting hits to my search pages with the following:

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Mem: 883 836 47 0 163 397
-/+ buffers/cache: 275 608
Swap: 2047 0 2047

My question:

1. Why the total ram just 883MB? I think it should 1024Mb?

2. The server still empty, but why I see the total used memory is 836Mb?

I only have experience with cpanel vps and when my server empty it only use around 200MB RAM and around 400MB ram usage when my vps load with 30+ account.

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A couple of days ago I came across www.just-ping.com site (it's a simple ping test site).

I tested my site avensen.com (IP: 72.232.147.154) with it, and got bad results like this one:

[url]

Santa Clara, U.S.A. Packets lost (20%) 50.6 51.9 52.8
Florida, U.S.A. Packets lost (80%) 45.6 45.6 45.7
Vancouver, Canada Packets lost (80%) 56.5 56.6 56.7
New York, U.S.A. Packets lost (20%) 50.7 57.2 61.5
Austin, U.S.A. Packets lost (60%) 9.5 9.6 9.9
Austin, U.S.A. Packets lost (90%) 9.4 9.4 9.4
Amsterdam, Netherlands Packets lost (60%) 121.6 122.4 123.3
Amsterdam1, Netherlands Packets lost (60%) 121.5 123.6 125.6
London, United Kingdom Packets lost (90%) 111.4 111.4 111.4
Sydney, Australia Packets lost (90%) 200.2 200.2 200.2
Stockholm, Sweden Packets lost (20%) 144.7 147.7 148.3
Cologne, Germany Packets lost (80%) 133.3 135.6 137.8
Madrid, Spain Packets lost (70%) 150.7 150.8 151.0
Paris, France Packets lost (60%) 128.4 132.5 135.5
Hong Kong, China Packets lost (30%) 196.1 196.4 196.8
Munchen, Germany Packets lost (60%) 131.7 131.8 132.0
Kraków, Poland Packets lost (70%) 196.3 198.5 200.2
Cagliari, Italy Packets lost (40%) 154.9 155.3 156.3
Melbourne, Australia Packets lost (50%) 199.6 205.5 208.2
Singapore, Singapore Packets lost (70%) 257.4 260.3 262.5

I'm trying to figure out if this is a network problem or a problem with my server. I don't get it, because there are no lost ICMP packets when I ping another hosts from my server, or when I ping my server from home PC.

And here is what server4sale support wrote:

Quote:

This is what we received from data center and will update you, when they get back to us.

"We apologize for the delay in responding to you. We are aware of an issue that involves our upstream provider, and we have opened a ticket with them to get the issue resolved ASAP. We have asked them to investigate this issue and attempt to isolate the cause. Once we have more information from them, we will update you here in this ticket.

In the meantime, if you note any changes (good or bad), please provide traceroutes BOTH "TO" your server, and "FROM" your server, as well as a 300 count ping summary. This request has been made by our upstream provider, as we will forward any additional pings and traceroutes we receive directly to them. Without the traceroutes both to and from the servers, the information will not be useful for their investigation.

We will provide you with updates thru this ticket as we receive information from our provider. If you have any additional questions, or need further assistance, feel free to contact us. We appreciate your patience, while we work with to resolve this issue."

Second message from support:

Quote:

The data center has informed that they have not yet received an update from their upstream provider as they used to inform them after performing changes.

However, for better investigation and providing the results more precisely to their upstream provider they have asked you to provide the latest:

Quote:

1) 300 ping results from your PC to server

2) Traceroute from your PC to Server and

3) Traceroute from Server to your PC

I'd really appreciate if you help me to get these results and isolate the problem.

IP of my server: 72.232.147.154

What's even stranger is that when I run a just-ping.com test over 72.232.147.174 IP (a machine in the same SAVVIS data center, I guess), I get "All OK results":

[url]

Santa Clara, U.S.A. Okay 50.9 52.3 55.3
Florida, U.S.A. Okay 46.1 51.5 54.6
Vancouver, Canada Okay 56.1 56.7 57.1
Austin, U.S.A. Okay 9.7 9.9 10.2
New York, U.S.A. Okay 49.8 51.9 54.7
Austin, U.S.A. Okay 9.7 10.0 10.3
Amsterdam1, Netherlands Okay 122.0 123.6 127.8
Amsterdam, Netherlands Okay 121.2 123.4 127.5
Sydney, Australia Okay 204.1 205.2 208.6
Hong Kong, China Okay 203.6 204.5 206.1
Stockholm, Sweden Okay 144.8 147.7 149.7
Cologne, Germany Okay 133.0 135.0 137.5
London, United Kingdom Okay 118.5 121.7 124.7
Munchen, Germany Okay 136.7 139.0 140.5
Kraków, Poland Okay 192.3 195.9 205.8
Cagliari, Italy Okay 156.3 156.8 157.4
Paris, France Okay 123.0 124.5 127.7
Madrid, Spain Okay 158.8 161.5 164.5
Amsterdam3, Netherlands Okay 125.7 130.9 134.8
Singapore, Singapore Okay 255.3 256.7 259.2
Melbourne, Australia Okay 229.8 230.3 231.0

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Version: 2.5
uid resource held maxheld barrier limit failcnt
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Code:
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# User@Host: admin_db[admin_db] @ localhost []
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====
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====

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The host reports that no changes to the server have been made recently.

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Quote:

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Feb 19 16:06:02 server proftpd[1982]: server.com (127.0.0.1[127.0.0.1]) - FTP session opened.
Feb 19 16:06:02 server proftpd[1982]: server.com (127.0.0.1[127.0.0.1]) - FTP session closed.
Feb 19 16:14:24 server proftpd[2471]: server.com (127.0.0.1[127.0.0.1]) - FTP session opened.
Feb 19 16:14:24 server proftpd[2471]: server.com (127.0.0.1[127.0.0.1]) - FTP session closed.
Feb 19 16:22:46 server proftpd[3062]: server.com (127.0.0.1[127.0.0.1]) - FTP session opened.
Feb 19 16:22:46 server proftpd[3062]: server.com (127.0.0.1[127.0.0.1]) - FTP session closed.
Feb 19 16:31:09 server proftpd[3696]: server.com (127.0.0.1[127.0.0.1]) - FTP session opened.
Feb 19 16:31:09 server proftpd[3696]: server.com (127.0.0.1[127.0.0.1]) - FTP session closed.
Feb 19 16:39:31 server proftpd[4185]: server.com (127.0.0.1[127.0.0.1]) - FTP session opened.
Feb 19 16:39:31 server proftpd[4185]: server.com (127.0.0.1[127.0.0.1]) - FTP session closed.
Feb 19 16:47:53 server proftpd[4946]: server.com (127.0.0.1[127.0.0.1]) - FTP session opened.
Feb 19 16:47:53 server proftpd[4946]: server.com (127.0.0.1[127.0.0.1]) - FTP session closed.
Feb 19 16:56:16 server proftpd[5495]: server.com (127.0.0.1[127.0.0.1]) - FTP session opened.
Feb 19 16:56:16 server proftpd[5495]: server.com (127.0.0.1[127.0.0.1]) - FTP session closed.
Feb 19 17:04:38 server proftpd[6206]: server.com (127.0.0.1[127.0.0.1]) - FTP session opened.
Feb 19 17:04:38 server proftpd[6206]: server.com (127.0.0.1[127.0.0.1]) - FTP session closed.
Feb 19 17:13:00 server proftpd[6661]: server.com (127.0.0.1[127.0.0.1]) - FTP session opened.
Feb 19 17:13:00 server proftpd[6661]: server.com (127.0.0.1[127.0.0.1]) - FTP session closed.
Feb 19 17:21:23 server proftpd[7225]: server.com (127.0.0.1[127.0.0.1]) - FTP session opened.
Feb 19 17:21:23 server proftpd[7225]: server.com (127.0.0.1[127.0.0.1]) - FTP session closed.

I see over a few hundred of these lines in /var/log/messages. The timestamp is exactly the same for every 2 lines (Proftp session- Opened and Closed). It's occuring every hour of the day. Is someone attacking the ftp daemon or something?

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