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

[Paolo Scarabelli <paolo () msw it>]

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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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