CBL Listed

Dec 1, 2007

4 times already this month we been listed by CBL

i cant for the life of me figure out why!

IP Address XX.XX.XX.XX was found in the CBL.

It was detected at 2007-11-30 16:00 GMT (+/- 30 minutes), approximately 17 hours, 30 minutes ago.

It has been relisted following a previous removal at 2007-11-25 23:59 GMT


I emailed them and it seems i get an autoresponse which makes no sense they reply me the following:

The IP was detected most recently at:

2007:11:20 ~21:00 UTC+/- 15 minutes (approximately 18 hours ago)

sending email in such a way as to strongly indicate that the IP itself
was operating an open http or socks proxy, or a trojan spam package.

In short, this IP is impersonating being a machine we know it _cannot_
be. No properly configured mail server does this under any circumstances.

You will need to examine the machine for a spam trojan or open
proxy. Up-to-date anti-virus tools are essential.

If the IP is a NAT firewall, we strongly recommend configuring the
firewall to prevent machines on your network connecting to the Internet
on port 25, except for machines that are supposed to be mail servers.

Software notes: If you are running Email Architect, set the
"Masqueraded domain" in SMTP service to be the fully qualified
domain name for the machine.

If you are using an Internet Security Systems firewall (eg:
Proventia M10), please contact ISS and obtain new firmware.
They are aware of issues with the CBL. The firmware version
that fixes this bug is, we believe, "3.5" (at least for
the M10).

Useful links:

[url]
[url](see "Securing your System" and "proxies")
[url]

For more information on securing NAT firewalls/gateways, please
see [url]

This entry has already been delisted from the CBL. Unless otherwise
stated, the CBL will relist this IP if the underlying issues are not
resolved, and the CBL detects the same thing again.

has anyone been in this problem before? ive got myself delisted but its just a pain keep waking up each morning to find this happening

is it possible that someoen who is accessing their email through outlook has a virus on their pc?

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Where Are Nameservers Listed

Jul 25, 2008

Which file can I find my nameservers listed in?

Godaddy was disallowing me to edit nameservers, so cPanel prevented me from setting up ns1.domain.com and ns2.domain.com, this has meant now I have a major problem: A client paid me to develop his site and he has now gone on holiday, he wanted it finished today but I can't put it online because he set the nameservers to ns1.domain.com ns2.domain.com whereas I have had to set up the nameservers as one.domain.com and two.domain.com due to godaddy disallowing me to create ns1 and ns2.

Now my question is: Is it possible to edit a config file that can set up NS1 and NS2 to work along side ONE and TWO? I'm using cPanel and I have root access.

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Repeated CBL Listed

Dec 7, 2007

They kindly provided me with timestamp as to when detection was happening and they sent me this description:

Timestamp: 2007-12-02 22:55:32
(ive attached the logs from below for around couople of minutes) If anyone knows how to solve this much appreicate it..or if anyone know what could be the issue!

In a nutshell, your IP is forging a well known domain as theEHLO/HELO - imagine connecting to, say aol.com and having your IPHELO as "apple.com". Understandably, when an IP connects to ourservers and presents such an obvious forgery, we're going to consider ita virus emitter or otherwise compromised.] This is what you need to keep in mind when you're trying to resolvesituations like this: 1) Our detections are based on port 25 SMTP connections your IP makesto one or more of our mail servers. The CBL listing _itself_ is theevidence/"proof"/log of the incident. We generally do not keep samples of CBL detections, because thevolumes are so horrendously high (presently more than 700,000detections per day). They never provide any additional information,because the headers, if any, are all fake anyway. In order to preserve the effectiveness of the CBL, informationbeyond what we've already given you will not be revealed.We can sometimes give additional information (eg: more precisetimestamps) if and only if we know it's necessary to find/fixthe problem. 2) The CBL detects suspicious SMTP activity, NOT spamming per-se. Inother words, the CBL detects email being sent in such a way as toindicate that the sender is compromised in some fashion into sendingviruses or spam.

As such, the CBL focuses on identifying how to prevent the behavior infuture, instead of, for example, identifying spammers that need to beterminated. Indeed, in the case of NAT firewalls, it is almost always impossiblefor us to precisely identify which machine behind your NAT is infected. Only your NAT logs (if you keep any and know what to look for) knowwhich machine is infected. In the case of NATs, our focus is on blocking the malicioustraffic getting to the Internet. We can give tips/pointers on howyou can identify specific infected machines behind a NAT, but ourpriority is to prevent _any_ infected machine behind your NATspewing junk to the Internet, because we know that for everyinfected machine you fix, another one (or more) will eventuallyspring up in its place, and we (and we suspect you) don't likeplaying a never-ending game of whack-a-mole. 3) The viruses we detect carry their own SMTP clients with them, and donot attempt to relay through your mail servers. Hence, email transitfilters (either inbound or outbound) on your mail servers can't help.Only AV scanning the infected machine does.

Similarly, the spamware (open proxy or spam trojan) we detect donot route through your mail servers either. 4) Most AV tools aren't very good at detecting/cleaning out establishedinfections. Especially those resulting from day-zero attacks.Particularly since many of these infections open back doors, and theoriginal infection vector downloads many pieces of software that _may_not be in themselves malware, just used in a malicious fashion. 5) The headers don't help at all. Since the virus/spamware has its ownclient, and doesn't pass through your server[s], the only thing knowableabout the virus/spamware is the peer (connection) address at therecipient's mail server - which is what we've listed - your NAT firewallif you have a NAT... Only your NAT firewall logs can tell you anydifferent. Short of AV scanning the infected machine, the only useable informationabout which machine is infected is in your NAT firewall logs - ifyou actually make any logs and keep them long enough. For the most part, then, a CBL listing of an IP means that the IPneeds to be fixed. If it's a NAT IP - port 25 blocking (and youcan find/fix the infected machine[s] at your leisure), if it's nota NAT - virus/malware eradication. 6) Outbound port 25 connection blocking on NAT firewalls (permittingonly your authorized mail servers) is the best solution for NATs. 7) If you have a NAT, once you've implemented port 25 blocking, younot only contain the viruses, your NAT firewall logs will immediatelytell you who is infected or is compromised with a spam trojan oropen proxy. 8) As far as we're aware, once port 25 blocking is instituted in ANAT, the only times people have continued to have trouble with CBLlistings is when the blocking wasn't working for some reason. Itwould be a good idea to test whether the blocking is in fact working.We have suggested procedures for this if you want - ask us.

2007-12-02 22:55:05 [19907] list matching forced to fail: failed to find host name for 201.58.9.244
2007-12-02 22:55:05 [9913] SMTP connection from [81.129.182.181]:60329 I=[69.16.237.199]:25 (TCP/IP connection count = 3)
2007-12-02 22:55:06 [9913] SMTP connection from [85.177.218.230]:9468 I=[69.16.237.199]:25 (TCP/IP connection count = 4)
2007-12-02 22:55:06 [19907] H=(20158009244.user.veloxzone.com.br) [201.58.9.244]:61429 I=[69.16.237.199]:25 F=<vash989@lfcc.edu> rejected RCP$
2007-12-02 22:55:06 [19907] SMTP connection from (20158009244.user.veloxzone.com.br) [201.58.9.244]:61429 I=[69.16.237.199]:25 closed by DROP$
2007-12-02 22:55:07 [19908] ident connection to 71.217.38.129 timed out
2007-12-02 22:55:07 [19909] ident connection to 81.129.182.181 timed out
2007-12-02 22:55:08 [9913] SMTP connection from [213.36.8.1]:3542 I=[69.16.237.199]:25 (TCP/IP connection count = 4)
2007-12-02 22:55:08 [19909] H=host81-129-182-181.range81-129.btcentralplus.com [81.129.182.181]:60329 I=[69.16.237.199]:25 F=<markhuu.Fabris@$
2007-12-02 22:55:08 [19909] SMTP connection from host81-129-182-181.range81-129.btcentralplus.com [81.129.182.181]:60329 I=[69.16.237.199]:25$
2007-12-02 22:55:09 [19910] H=e177218230.adsl.alicedsl.de [85.177.218.230]:9468 I=[69.16.237.199]:25 F=<Vesterinenowao@jcel.com> rejected RCP$
2007-12-02 22:55:09 [19910] SMTP connection from e177218230.adsl.alicedsl.de [85.177.218.230]:9468 I=[69.16.237.199]:25 closed by DROP in ACL
2007-12-02 22:55:09 [19908] H=71-217-38-129.tukw.qwest.net [71.217.38.129]:63507 I=[69.16.237.199]:25 F=<0agwampler@rapidreply.net> rejected $
2007-12-02 22:55:09 [19908] SMTP connection from 71-217-38-129.tukw.qwest.net [71.217.38.129]:63507 I=[69.16.237.199]:25 closed by DROP in ACL
2007-12-02 22:55:09 [19911] H=dyn-213-36-8-1.ppp.tiscali.fr (dyn-213-36-8-129.ppp.tiscali.fr) [213.36.8.1]:3542 I=[69.16.237.199]:25 F=<Norbe$
2007-12-02 22:55:09 [19911] SMTP connection from dyn-213-36-8-1.ppp.tiscali.fr (dyn-213-36-8-129.ppp.tiscali.fr) [213.36.8.1]:3542 I=[69.16.2$
2007-12-02 22:55:13 [9913] SMTP connection from [201.212.156.23]:51905 I=[69.16.237.199]:25 (TCP/IP connection count = 1)
2007-12-02 22:55:13 [9913] SMTP connection from [200.122.38.174]:1152 I=[69.16.237.199]:25 (TCP/IP connection count = 2)
2007-12-02 22:55:14 [9913] SMTP connection from [201.233.222.43]:2980 I=[69.16.237.199]:25 (TCP/IP connection count = 3)
2007-12-02 22:55:16 [19915] ident connection to 201.233.222.43 timed out
2007-12-02 22:55:17 [19915] H=cable201-233-222-43.epm.net.co (castellanos.une.net.co) [201.233.222.43]:2980 I=[69.16.237.199]:25 F=<Chasityse$
2007-12-02 22:55:17 [19915] SMTP connection from cable201-233-222-43.epm.net.co (castellanos.une.net.co) [201.233.222.43]:2980 I=[69.16.237.1$
2007-12-02 22:55:18 [19920] cwd=/home/annajwa/public_html/forum 2 args: /usr/sbin/sendmail bloochunc@bk.ru
2007-12-02 22:55:18 [19920] 1IyxiY-0005BI-5f <= annajwa@host.mpadc.com U=annajwa P=local S=747 T="Welcome to An- Najwa" from <annajwa@host.mp$
2007-12-02 22:55:18 [19921] cwd=/var/spool/exim 3 args: /usr/sbin/exim -Mc 1IyxiY-0005BI-5f

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I have a server that keeps getting listed by DSBL. It is RHEL 3 running Plesk and Qmail. In the MAIL config SMTP relay is set to "Authorization is Required" and the SMTP box is checked. I have a couple other very similar server setups and they have never been listed, so I dont know why this one is. I suspect it may be a bug.

As for the last listing (yesterday) here is the exerpt from the maillog showing the SMTP relay

===================
Aug 26 13:36:48 slv3 qmail-queue[426]: scan: the message(drweb.tmp.0PW0bG) sent by nobody@cor.neva.ru to listme@listme.dsbl.org should be passed without checks, because contains uncheckable addresses
Aug 26 13:36:48 slv3 qmail-queue-handlers[428]: to=listme@listme.dsbl.org
Aug 26 13:36:48 slv3 qmail-queue-handlers[428]: recipient[3] = 'listme@listme.dsbl.org'
Aug 26 13:36:48 slv3 qmail-queue-handlers[428]: handlers dir = '/var/qmail//handlers/before-queue/recipient/listme@listme.dsbl.org'
Aug 26 13:36:48 slv3 qmail: 1188153408.989183 starting delivery 7244: msg 2327042 to remote listme@listme.dsbl.org
Aug 26 13:36:48 slv3 qmail-remote-handlers[430]: to=listme@listme.dsbl.org
===================

why my server is relaying?

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check this out :

[url]

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what should i do to correct the probleme i made some changes on /etc/hostname and etc/hosts and requested delisting but without positive results.

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[code]....

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