full-disclosure - Re: .NET REMOTING on port 31337

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Date: Fri, 28 Sep 2007 13:23:13 -0500
From: "Joel R. Helgeson" <joel@...geson.com>
To: "'Simon Smith'" <simon@...soft.com>,
	"'The Security Community'" <thesecuritycommunity@...il.com>
Cc: 'Full-Disclosure' <full-disclosure@...ts.grok.org.uk>
Subject: Re: .NET REMOTING on port 31337

Yes, I have seen similar hacks that have come primarily from French hackers.
They utilize legitimate network administration tools to "remotely
administer" your network for you.  GO to that box and run the fport.exe util
and handle.exe, or use sysinternals tools to find the app and its stack that
were used to open the port.

-joel

-----Original Message-----
From: full-disclosure-bounces@...ts.grok.org.uk
[mailto:full-disclosure-bounces@...ts.grok.org.uk] On Behalf Of Simon Smith
Sent: Friday, September 28, 2007 12:59 PM
To: The Security Community
Cc: Full-Disclosure
Subject: Re: [Full-disclosure] .NET REMOTING on port 31337

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Right,
	It set off alarms with all of my penetration testers hence why we're
researching it. The question I have is, has anyone seen port 31337
respond with the .NET REMOTING banner? Our nmap -A claims that it is
.NET REMOTING... just seems weird...

Anyone know of any backdoors that do that?

The Security Community wrote:
> The last time I saw anything on port 31337 (ELEET) it was during a
> vulnerability assessment.  We shut it down and stopped the assessment.
>  Management wouldn't let us investigate, then blew the cover on the
> assessment a week or two later.
> 
> It's almost always bad, but you may just have an admin with a stupid
> sense of humor.
> 
> 31337 should always throw a red flag.
> 
> On 9/28/07, Simon Smith <simon@...soft.com> wrote:
> 
> Has anyone ever heard of .NET REMOTING running on port 31337? If so,
> have you ever seen it "legitimate"?
> 
> 
>>
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- --

- - simon

- ----------------------
http://www.snosoft.com

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_______________________________________________
Full-Disclosure - We believe in it.
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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/