Received: from User ([62.245.183.100]) by MY DOMAIN with Microsoft SMTPSVC(6.0.3790.3959); <--particularly that IP address
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IP provider says i'm sending Paypal phishing emails
Tuesday afternoon I received the following email from my IP provider:
The Qwest Security Services team has received numerous complaints regarding fraudulent "phishing" Unsolicited Bulk Email (UBE) originating from your account. . . . .
Sample of fraudulent email:
Received: from MY DOMAIN (unknown [MY IP ADDRESS) by mpls-qmqp-01.inet.qwest.ne
Received: from User ([62.245.183.100]) by MY DOMAIN with Microsoft SMTPSVC(6.0.3790.3959);
Mon, 24 Aug 2009 22:15:50 -0600
From: "PayPal"<comptelimite@payp
Subject: Votre compte PayPal a été limité! [Mardi 25 Août 2009 05:19:56 HAE]
Date: Tue, 25 Aug 2009 06:02:09 +0200
MIME-Version: 1.0
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding:
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2600.0000
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000
Message-ID: <SERVERwJ9DpMR4JQSkx000001
X-OriginalArrivalTime: 25 Aug 2009 04:15:50.0431 (UTC) FILETIME=[BAB622F0:01CA253
To: undisclosed-recipients:;
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <html> <head> <style type="text/css"><!-- body, p, td, div, li, ul, input { font-family:Arial, Helvetica, sans-serif;font-size:12px;
--></style> </head> <body>
<table cellpadding="5" cellspacing="0" border="0" width="60%"> <tr> <td align="center"> <table cellpadding="5" cellspacing="0" border="0" width="60%"> <tr><td width="69%"><IMG src="http://images.paypal.
border="0"></td> <td width="31%"> </td> </tr> </table> </tr> <tr> <td background="http://images.
Can someone help me decifer what the header of this email means?
And can someone help me narrow this issue down? I have a SBS2003 Server with Exchange 2003, but I don't believe it is coming through exchange. I have 6 other clients on this network also running WinXP. Is anyone familiar with this Paypal Phishing & a sure way of detecting and removing it?
Since recieving the email from qwest, now all my emails are being returned as denied due to Paypal Phishing.
Thank you
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Answers
The email is coming from your network. It is being send from that 62.x.x.x address via a system on your network.
Quick and dirty method is to block port 25 on your firewall and watch the logs. A compromised machine on your network will soon fill the logs.
Do you route email via your ISPs SMTP server, or directly by DNS? You cannot rule out the SBS server being abused at this point. It could be an authenticated relay for example. If the header says domain.com then that points to SBS, as that is how SBS configured the SMTP banner by default.
My spam cleanup guide can provide more information
http://www.amset.info/exch
It doen't have to be malware on the SBS server to be the cause. Exchange as it stands can be abused.
Simon.
Nothing in the spam message can be trusted. It may be spoofed it may not.
Unfortunately I suspect your SBS server. SBS by default has a feature called authenticated relaying enabled. If an account gets compromised then your server can be used to send the spam. The originating machine will show in the SMTP logs.
The IP address is in Germany, so maybe a compromised system or the source of the spammer.
Simon.
I'm running SBS2003 with just the basic firewall. Where do I find the SMTP logs? Does disabling outbound mail from within Exchange block port 25? I disabled it yesterday and this morning I had only 3 valid abound messages. I do have Excange using smart host for delivery. It doesn't appear that my ip is blacklisted by anyone other than one of my IP providers relay servers. SHould I switch to delivery by DNS?
If you are using your ISPs servers for outbound email then that would explain why you haven't got blacklisted. Blacklisting occurs on the source of the message when delivered to the machine detecting it - which would be your ISPs server. Switching to DNS delivery wouldn't help other than allowing you to see the messages in your queues that have failed.
Disabling outbound email in Exchange simply does that - disables outbound flow of email. Messages would queue. However it doesn't mean you are in the clear. It may mean that the spammer isn't using your system at the moment. The message that you have posted is from Monday.
A firewall is of no use here, because it isn't an attack on the ports. It is an attack on the application.
That would be like taking a car away because the driver cause an accident. The car wasn't the cause, the driver was.
Therefore you have to look at the configuration of the SMTP server on the Exchange server and ensure that you only have what you need enabled. If you do not have any clients using POP3/SMTP then you can disable authenticated relaying for example.
Simon.
Thank you for your help. In the exchange server logs I did find my IP's concern. Two different sets of UBE was being sent out Monday through Wednesday night about 7:07 p.m. when I began running spyware scans on my workstations. There were two systems infected. One with qakbot.worm and the other with backdoor.bot as detected by Antimalware Bytes.
I did check my server for open relay status and it is secure. I did then disable all pop3/smtp as I don't use that service, although I had enabled it quite sometime ago trying to get it to work.
Now it's a matter of getting Qwest to re-open their smarthost for me.
Thank you so much for the help.
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by: mrrooniePosted on 2009-08-28 at 07:50:50ID: 25208277
run a full virus scan on all clients and servers - sounds like you have a mass mailer lurking around somewhere