Re: Nessus activity detection quest

[Y M <snort () outlook com>]

Correct. But what I have seen - based on limited testing - and some discussions over the Nessus forums, is that Nessus 
would enable/disable plugins automatically based on the services/ports/applications discovered even if I explicitly 
enable/disable plugins. I have seen the rules I mentioned earlier trigger on PCI scans, Advanced Network Scans, and Web 
Application Scans.
This makes me believe that these are triggering during the initial discovery phase of a Nessus scan. However, I haven't 
verified this assumption by capturing packets or otherwise.
YM

From: jthoel () gmail com
Date: Thu, 23 Jul 2015 13:32:25 -0400
Subject: Re: [Snort-users] Nessus activity detection quest
To: snort () outlook com
CC: soy_siberiano () yahoo com; snort-users () lists sourceforge net

Wouldn't it also depend on the plugins that you are using with Nessus?
On Thu, Jul 23, 2015 at 1:10 PM, Y M <snort () outlook com> wrote:



There are about 3-5 signatures that almost always trigger when a Nessus  scan is initiated with different scan types, 
at least in all cases that I was able to verify. While these signatures do not identify that a Nessus scan in 
particular is ongoing, but the fact of seeing them trigger together is indicative of a Nessus scan in all cases I 
encountered. I will have to dig up some old data to get the sid(s) of these signatures.
YM

From: jesler () cisco com
To: soy_siberiano () yahoo com
Date: Thu, 23 Jul 2015 11:06:35 +0000
CC: Snort-users () lists sourceforge net
Subject: Re: [Snort-users] Nessus activity detection quest






So, you are doing a portscan, and the only alerts you see are portscans?



Nessus doesn't actually send exploits at a machine, it scans for the presence of characteristics that would make the 
machine vulnerable to an exploit.  There's nothing for Snort to detect, except the portscan part really.  



--
Joel Esler 
Manager, Threat Intelligence and Open Source
Talos Group
Sent from my iPhone


On Jul 23, 2015, at 1:17 AM, Oleg Ruso <soy_siberiano () yahoo com> wrote:







Hi List!



snort-2.9.7.0



I`m looking for some Snort rules for a Nessus activity detection.

Got an another alerts, but my Snort does not reveal a Nessus activity.

The preprocessor sfportscan detection only i see.



Regards, Alex






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