Question

Help we are sending spam from somewhere inside our domain!

Asked by: RAMCIT

Hello Experts!
Earlier today, I found out we had been listed by SPAMCOP (http://spamcop.net/bl.shtml) as an originator of spam email, and also with PSBL (http://psbl.surriel.com). Can anyone please point me in the right direction as far as finding out a way to see if any of the PCs inside our domain are infected with some kind of spamware?

Thanks a lot!

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Asked On
2006-10-26 at 08:01:42ID22038583
Tags

spam

,

domain

,

from

,

sending

Topic

Windows Network Security

Participating Experts
2
Points
500
Comments
14

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Answers

 

by: AdamRobinsonPosted on 2006-10-26 at 09:01:22ID: 17812895

Assuming you are running in a 2000/2003 environment, see this link:

http://www.petri.co.il/preventing_exchange_2000_2003_from_relaying.htm

You can find many other solutions easily by Googling for how to close an Open Mail Relay in your Domain Operating System Environment

 

by: RAMCITPosted on 2006-10-26 at 09:03:50ID: 17812920

Actually Im runing Exchange 5.5 on an NT enviromnent.

 

by: AdamRobinsonPosted on 2006-10-26 at 09:08:20ID: 17812969

 

by: RAMCITPosted on 2006-10-26 at 10:54:41ID: 17813886

ll, according to http://www.dnsreport.com/ we reject releys.

 

by: AdamRobinsonPosted on 2006-10-26 at 11:05:49ID: 17813970

If you open the queues in your Exchange System Manager, do you see a lot of mails waiting to be sent?

 

by: RAMCITPosted on 2006-10-26 at 11:10:22ID: 17814010

more than usual yes

 

by: AdamRobinsonPosted on 2006-10-26 at 11:12:15ID: 17814027

Ok, I know DNS Report shows you reject relays, but try following the instructions in the link above and see if they go away. ;)

 

by: RAMCITPosted on 2006-10-26 at 11:14:26ID: 17814048

Well I cannot seem to get into the server via telnet, says:

Server allows NTLM authentication only

 

by: legalsrlPosted on 2006-10-29 at 01:39:42ID: 17828211

OK....

What AV and AntiSpyware do you use ?

Also, if you are using cisco routers let me know as I've got some neat tricks for these.

Cheers
Si


 

by: RAMCITPosted on 2006-10-30 at 07:47:10ID: 17834456

Well on this server we have Trend Micro Scanmail for the exchange
No active antispyware.

 

by: RAMCITPosted on 2006-10-30 at 07:47:45ID: 17834460

oh and this T1 connection uses a Cisco 2600 router with a watchguard firebox firewall.

 

by: legalsrlPosted on 2006-10-30 at 11:36:50ID: 17836570

Does your Cisco router have Netflow enabled ?

Thanks
Si

 

by: RAMCITPosted on 2006-10-30 at 11:38:33ID: 17836586

I have no idea

 

by: legalsrlPosted on 2006-10-30 at 13:11:06ID: 17837366

OK,

OK, from a quick google, the 2600 routers do have Netflow on them.

Try this

Go here ---> http://www.manageengine.co.uk/

Download NetFlow Analyzer and install it....configure the router as per the instructions in the documentation to enable netflow packets and then leave it to run for an hour.

Go back in to NetFlow Analyzer and you will see a list of traffic broken down by type and then you see which machines are sending large amounts of SMTP traffic.

Let me know if you get stuck

Thanks
Si

20120131-EE-VQP-002

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