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<p class="MsoNormal">Agreed DNS/IP reputation is still about the best. Then move on with everything else we should be doing.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Decrypting the content would bring us to the next problem. Malware is commonly encrypted to prevent AntiVirus from pattern matching or hash matching.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Decrypting the content always struck me as something that is better suited for spotting exfiltration. Searching for known clear text similar to “FBI Classified” or a watermark in documents sounded like an attainable goal from SSL decryption.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Kevin Burke<o:p></o:p></span></p>
<p class="MsoNormal">802-540-0979<o:p></o:p></p>
<p class="MsoNormal">Burlington Telecom<o:p></o:p></p>
<p class="MsoNormal">200 Church St, Burlington, VT<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> NANOG <nanog-bounces+kburke=burlingtontelecom.com@nanog.org>
<b>On Behalf Of </b>Jared Geiger<br>
<b>Sent:</b> Friday, October 9, 2020 3:45 PM<br>
<b>To:</b> nanog@nanog.org<br>
<b>Subject:</b> Re: Securing Greenfield Service Provider Clients<o:p></o:p></p>
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<strong><span style="font-family:"Calibri",sans-serif">External Source</span></strong>. Please use proper judgment and caution when opening attachments, clicking links, or responding to this email.</span><o:p></o:p></p>
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<p class="MsoNormal">DNS filtering might be an easier option to get most of the bad stuff with services like 9.9.9.9 and 1.1.1.2. Paid options like
<a href="http://dnsfilter.com">dnsfilter.com</a> will give you better control. Cloudflare Gateway might also be an option.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Fri, Oct 9, 2020 at 12:29 PM Christopher J. Wolff <<a href="mailto:cjwolff@nola.gov">cjwolff@nola.gov</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Dear Nanog;<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hope everyone is getting ready for a good weekend. I’m working on a greenfield service provider network and I’m running into a security challenge. I hope the great minds here
can help.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Since the majority of traffic is SSL/TLS, encrypted malicious content can pass through even an “NGFW” device without detection and classification.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Without setting up SSL encrypt/decrypt through a MITM setup and handing certificates out to every client, is there any other software/hardware that can perform DPI and/or ssl analysis
so I can prevent encrypted malicious content from being downloaded to my users?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Have experience with Palo and Firepower but even these need the MITM approach. I appreciate any advice anyone can provide.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Best,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">CJ<o:p></o:p></p>
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