Infected Messages Not Being Spam Checked

Fri Jan 22 21:40:25 GMT 2010

I am having a problem with Virus infected messages not being spam checked and getting delivered to users. 

My configuration is MS 4.78.17-1 running on CentOS 5.4 with spamassassin 3.2.5-1 from the CentOS distribution, clamav 0.95.3-1and razor-agents 2.84-1 from rpmforge, pyzor 0.5.0 and dcc 1.3.115. I am using the following additional spamassassin rules; Sought, OpenProtect and a couple of custom ones. All messages with a spam score of > 5.0 and <10.0 are redirected to a special mailbox. Anything >10.0 are deleted. This works great as I have a false positive rate of 0.16% and a false negative rate of 0.87% (if I exclude the viruses that passed). None of the false positives are high scoring spam >10.0.

Here is an example of a message that was not spam checked:

Date:	Fri, 22 Jan 2010 08:50:57 +1000
From:	"DHL Manager Keven Allen" <shipping at dhl.com>
Reply-To: improvesx66 at wires.tv
Message-ID: <256744380.35200801834064 at wires.tv>
To: user at mlrw.com
Subject: {VIRUS?} DHL Delivery Problem Number 81419.
MIME-Version: 1.0
Content-Type: multipart/mixed;
  boundary="----------4B369E401538E9"

------------4B369E401538E9
Content-Type: text/plain; charset=Windows-1252
Content-Transfer-Encoding: 7bit

Dear customer! 

The courier company was not able to deliver your parcel by your address.
Cause: Error in shipping address. 

You may pickup the parcel at our post office personaly!

Attention!
The shipping label is attached to this e-mail. 
Please print this label to get this package at our post office.

Please do not reply to this e-mail, it is an unmonitored mailbox!

Thank you.
DHL Delivery Services.

------------4B369E401538E9
Content-Type: application/zip; name="DHL_Label_NR06283.zip"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="DHL_Label_NR06283.zip"

In the logs for clamd I see the following for that attachment: DHL_Label_NR06283.zip: Suspect.Bredozip-zippwd-2 FOUND

If I run spamassassin against a quarantined copy of the message here is it's score:

Content analysis details:   (23.1 points, 5.0 required)

 pts rule name              description
---- ---------------------- --------------------------------------------------
 0.7 SARE_RECV_IP_FROMIP3			Received line is IP address from IP address
 3.0 RCVD_IN_XBL            					RBL: Received via a relay in Spamhaus XBL
                            							[165.228.74.75 listed in zen.spamhaus.org]
 2.0 RCVD_IN_BL_SPAMCOP_NET RBL: 	Received via a relay in bl.spamcop.net
               									[Blocked - see <http://www.spamcop.net/bl.shtml?165.228.74.75>]
 1.0 BAYES_60              					BODY: Bayesian spam probability is 60 to 80%
                          							[score: 0.6792]
 0.5 RAZOR2_CHECK           				Listed in Razor2 (http://razor.sf.net/)
 1.5 RAZOR2_CF_RANGE_E4_51_100 	Razor2 gives engine 4 confidence level
                            							above 50%
                            							[cf: 100]
 0.5 RAZOR2_CF_RANGE_51_100 		Razor2 gives confidence level above 50%
                           							[cf: 100]
 3.7 PYZOR_CHECK            				Listed in Pyzor (http://pyzor.sf.net/)
 2.2 DCC_CHECK              					Listed in DCC (http://rhyolite.com/anti-spam/dcc/)
 0.0 DIGEST_MULTIPLE        				Message hits more than one network digest check
 4.0 JM_SOUGHT_1            				Body contains frequently-spammed text patterns
 4.0 JM_SOUGHT_2            				Body contains frequently-spammed text patterns

As you can see it's greater than 10.0 which means it would have been deleted.

Can anyone help me? I need to get these type of messages spam checked.

Thanks.

Mike

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