full-disclosure - Re: Open proxy scanner experience

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Message-ID: <C423C869.297D3%jlay@slave-tothe-box.net>
Date: Thu, 10 Apr 2008 13:36:41 -0600
From: James Lay <jlay@...ve-tothe-box.net>
To: Full-disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: Open proxy scanner experience




On 4/10/08 10:42 AM, "Valdis.Kletnieks@...edu" <Valdis.Kletnieks@...edu>
wrote:

> On Thu, 10 Apr 2008 07:30:36 MDT, James Lay said:
> 
>> So yesterday a network that I do work for had it's mail server scanned.  I
>> reported the scan (snort reported nmap -F scan) to the offending netblock
>> owner, thinking that they had a compromised machine.  I was surprised to
>> receive an email this morning stating "Oh that's just our open proxy
>> scanner".  Now....I've dealt with some open proxy scanners and seeing the
>> activity before, but GOOD GANDHI...they scanned the ENTIRE port range of the
>> machine..it took almost 3 hours from start to finish.  Has anyone else seen
>> such aggressive "open proxy" scanning like that?
> 
> OK, I'll bite - did they initiate the scan when your mailserver first
> tried to contact theirs, and greylist you until the scan finished, or were
> they idiots and accepted the mail before the scan finished, or are they
> complete and total bozos and they're trying to scan the entire Internet
> proactively?


I have no clue as the outgoing mail system isn't under my control.
Considering it's a US company that doesn't do international business, and
the remote/scanning host is in Russia, I kinda doubt it ;)

Thanks all.

James


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