Re: Strange SMTP sessions with 'helo=<large negative number>' syntax

["Maxime Ducharme" <mducharme () cybergeneration com>]

Hello

some more info on ip address conversion :
http://www.pc-help.org/obscure.htm
http://gregsearle.tripod.com/spam_tech.html

Web tool to do conversion :
http://www.csgnetwork.com/ipaddconv.html

for the reason about the negative number i dont
have a clue, maybe a bug in their spam application ?

Happy new year to SF members !

Maxime Ducharme



----- Original Message ----- 
From: "Paolo Scarabelli" <paolo () msw it>
To: "Mike Davis" <mdavis () imperfectnetworks com>
Cc: <mis () seiden com>; "max" <max () neuropunks org>;
<incidents () securityfocus com>
Sent: Thursday, December 29, 2005 9:49 PM
Subject: Re: Strange SMTP sessions with 'helo=<large negative number>'
syntax


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>
> Hi there,
>
> I remember we were doing this in Singapore a few years back to reach
> some of the website that were blocked by the provider's proxy, it was
> just a matter of converting an IP number (which is a 4 bytes word) to
> the equivalent 32 bit integer.
>
> Something like:
>
> black.box.sk =>
> 66.250.131.132 =>
> 0x42F48384 =>
> 1123320708
>
> I don't know if it works on IE anymore, on Firefox and Konqueror it
doesn't.
> Regards,
>
>
> Paolo.
>
> Mike Davis wrote:
> > hehe, didnt even notice max untill i hit reply...
> >
> >
> > the this be a screwy way to get some poor implementation of
> > gethostbyname() (windows?) to interpret as an ip address? i vaguely
> > recall an ie flaw a few years back doing something similar to disguise
> > urls.. but i think they were removing dots like this:
> >
> > http://19216818/pornsite.html
> >
> > dont remember
> > -phar
> >
> >
> > On Thu, 2005-12-29 at 00:33 -0800, mis () seiden com wrote:
> >
> > > this has been going on for weeks.
> > >
> > > i believe they're all open proxies or spambots.
> > >
> > > (some of us use this as an oracle for open proxies.)
> > >
> > > On Wed, Dec 28, 2005 at 04:39:14PM -0500, max wrote:
> > >
> > > > Hello all,
> > > > I find this inmy logs throughout the day today:
> > > >
> > > > Dec 28 16:35:52 finn postfix/smtpd[13320]: NOQUEUE: reject: RCPT from
pcp0012209034pcs.blairblvd.tn.nash.comcast.net[69.245.57.210]: 501
<-1217882552>: Helo command rejected: Invalid name;
from=<shuu () grandlakeindexing com> to=<dylanfans-unsubscribe () dylanirvana com>
proto=SMTP helo=<-1217882552>
> > > > Notice that helo section is a negative number (which is why my postfix
rejects the message)
> > > > There are about 5 messages a minute at its peak, and this has been
going on most of the day today (EST time zone)
> > > > Some of the connecting IP's are listed in various black lists, such as
OPM.
> > > > Has anyone noticed this as well? Is this a virus or just some new spam
tool?
> > > > Some more rejected messages below:
> > > >
> > > > Dec 28 16:37:50 finn postfix/smtpd[34627]: NOQUEUE: reject: RCPT from
cpe-66-75-65-130.socal.res.rr.com[66.75.65.130]: 501 <-1218008120>: Helo
command rejected: Invalid name; from=<Laudat () gma-consulting-fr com>
to=<dylanfans-unsubscribe () dylanirvana com> proto=SMTP helo=<-1218008120>
> > > > Dec 28 16:37:54 finn postfix/smtpd[13320]: NOQUEUE: reject: RCPT from
unknown[219.130.49.89]: 554 Service unavailable; Client host [219.130.49.89]
blocked using opm.blitzed.org; Open proxy - see
http://opm.blitzed.org/219.130.49.89; from=<burkel () greenacresmortgage com>
to=<max () neuropunks org> proto=SMTP helo=<-1209697480>
> > > > Dec 28 16:38:10 finn postfix/smtpd[34627]: NOQUEUE: reject: RCPT from
194-144-9-218.du.xdsl.is[194.144.9.218]: 501 <-1209697480>: Helo command
rejected: Invalid name; from=<brenno () grandslamtennistours com>
to=<max () neuropunks org> proto=SMTP helo=<-1209697480>
> > > > Thanks,
> > > >
> > > > Max
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