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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I disagree, don’t block access to the port. Monitor and capture
it.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Joel’s First rule of forensics: Don’t just do something, stand
there!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Watch it, monitor it. If it is a crafty backdoor, there are
dozens of others to enable bad guys to regain entry.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Blocking lets the hacker know you might be on to them. IF it is
legit, then it could cause a problem.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Telnet to the port, see what it says on connection; run fport or
sysinternals utilities on the box to see the stack the program uses.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>-joel<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> full-disclosure-bounces@lists.grok.org.uk
[mailto:full-disclosure-bounces@lists.grok.org.uk] <b>On Behalf Of </b>Fabrizio<br>
<b>Sent:</b> Friday, September 28, 2007 1:31 PM<br>
<b>To:</b> Full-Disclosure<br>
<b>Subject:</b> Re: [Full-disclosure] .NET REMOTING on port 31337<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>If you think it's that
critical, (i think it's that critical) start by blocking any connections from
anywhere to that machine/port. See if anyone complains. Check any old firewall
logs for that port while you're at it. Then continue your investigation!! <br>
<br>
Fabrizio<o:p></o:p></p>
<div>
<p class=MsoNormal><span class=gmailquote>On 9/28/07, <b>Simon Smith</b> <<a
href="mailto:simon@snosoft.com">simon@snosoft.com</a>> wrote:</span><o:p></o:p></p>
<p class=MsoNormal>-----BEGIN PGP SIGNED MESSAGE-----<br>
Hash: SHA1<br>
<br>
Got output... and it was... no idea what it was... can't paste it due to<br>
confidentiality though.<br>
<br>
Fabrizio wrote:<br>
> .NET Remoting is "a generic system for different applications to use
to <br>
> communicate with one another." It's part of the .NET framework,<br>
> obviously. (not trying to be a smart ass)<br>
><br>
> I'm gonna take a wild guess and say it's not a good thing......<br>
><br>
> Connect to it, and see if you get any output, if you haven't already<br>
> done so.<br>
><br>
> Fabrizio<br>
><br>
><br>
><br>
> On 9/28/07, * Simon Smith* <<a href="mailto:simon@snosoft.com">
simon@snosoft.com</a><br>
> <mailto:<a href="mailto:simon@snosoft.com">simon@snosoft.com</a>>>
wrote:<br>
><br>
><br>
> Has anyone ever heard of .NET REMOTING running on port 31337? If so,<br>
> have you ever seen it "legitimate"? <br>
><br>
><br>
<br>
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> ------------------------------------------------------------------------<br>
<br>
> _______________________________________________<br>
> Full-Disclosure - We believe in it.<br>
> Charter: <a href="http://lists.grok.org.uk/full-disclosure-charter.html">http://lists.grok.org.uk/full-disclosure-charter.html</a><br>
> Hosted and sponsored by Secunia - <a href="http://secunia.com/">http://secunia.com/</a><br>
<br>
<br>
- --<br>
<br>
- - simon<br>
<br>
- ----------------------<br>
<a href="http://www.snosoft.com">http://www.snosoft.com</a><br>
<br>
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