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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">DoS attacks mean different things, in different contexts, on different networks. So you really need to write them yourself and tag them as LOCAL.
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Here is an example of one I wrote to detect UDP floods on port 80 outbound.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">alert udp $HOME_NET any -> $EXTERNAL_NET 80 (msg:"LOCAL DOS UDP port 80 flood outbound, Potential DOS"; threshold: type both, track by_dst, count 5000, seconds
5; classtype:misc-activity; sid:4;)<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">-Coop<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"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Oisf-users <oisf-users-bounces@lists.openinfosecfoundation.org>
<b>On Behalf Of </b>Brano Kramár<br>
<b>Sent:</b> Tuesday, March 26, 2019 2:44 AM<br>
<b>To:</b> oisf-users@lists.openinfosecfoundation.org<br>
<b>Subject:</b> Re: [Oisf-users] dataset testing<o:p></o:p></span></p>
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<p class="MsoNormal">Hi, I want to use suricata as IDS in my network. Firstly I decided to try it in offline mode on existing datasets. I am using ET open rules now. After enabling all rules with priority 1 or 2, Suricata wasn`t able to detect all DoS attacks
in dataset created by <a href="https://www.unb.ca/cic/datasets/ids-2017.html" target="_blank">
https://www.unb.ca/cic/datasets/ids-2017.html</a><o:p></o:p></p>
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<p class="MsoNormal">Dataset from wednesday should contain different DoS attacks, but Suricata generated only 3 alerts. Did I make any mistake in configuration? Is Suricata and ET open rules able to detect DoS attacks?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">thanks<o:p></o:p></p>
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