Snort is an open source network intrusion detection and prevention system (NIDS/NIPS).

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Documentation on Snort rules and alert tuning, especially for new users

I just started using Snort. There is a lot to it. I'm just looking for better documentation of what some of the Snort rules actually mean -- i.e. How I should react to them when I have an alert for a ...
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1answer
927 views

Snort even though working properly does not report majority of rules

I have installed Snort 2.9.7.0 and it does not detect majority of attacks, such as nmap port scans, downloading exe files, opening documents containing keyword "root". I use Snort together with ...
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1answer
79 views

How use snort with local.rules in offline mode?

I'm using SecurityOnion distro and I would to run snort on my pcap files. Is there a way to specify just one rule? I couldn't understand whether local.rules is used. How can I show only the result ...
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1answer
83 views

Problem with Snort rule

alert tcp $HOME_NET any -> $EXTERNAL_NET 80 (msg:"Get2 method"; flow: to_server, established; dsize: >20; sid:1000006; priority: 15) Snort does not generate any alert, whereas when I write the ...
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311 views

Question on SNORT Rule

I am new to SNORT and can not figure out what the following rule means: alert tcp $EXTERNAL_NET any-> $HOME_NET any (msg:"SCAN FIN"; flags: F; reference:arachnids,27;
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519 views

Security Onion:snorby alerts shows all local nerwork source IP(public and private)

I have just installed Security Onion distro based on ubuntu. This distro does a great job of combining multiple tools like snort/suricata,sguil,snorby,elsa,bro ids,squert. In my Security Onion ...
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49 views

Snort Portscan Preprocessor Analysis

Remarks I really apologize if this content isn't matching the community, but I am not getting approved on snort-mailing lists and I don't know what can I do for the same, therefore I feel this can be ...
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30 views

Snort false positive, yet suspicious

I have Snort installed and tuned nicely with ET Rules on my pfSense, both my pfSense and the modem are using Googles public DNS 8.8.8.8. Recently I was denied access to google.com, and by reviewing ...
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11 views

Adding Windows 7 VM as a log source/forcing the IDS inline

I'm investigating ways to add my Windows 7 VM as a log source or even run that traffic through my IDS VM and then out to the internet but I'm not entirely sure how to approach it. Does anybody have ...
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138 views

Snort gives “could not create the registry key” error for multiple kinds of operations

I've set up a host-only network in Virtualbox consisting of a Kali linux machine and a Windows 7 machine (the host is running OS X). I have Snort installed on Windows 7 and am attempting to verify ...
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119 views

Barnyard2 Can't pull xref from unified2 format

I have snort configured to log unified2 in my snort.conf file and am using barnyard2 to parse the unified2 results. It works, except I can seem to figure out to pull the event reference (xref) out of ...
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297 views

Snort sfportscan does not log in unified2 file format

I'm running Snort version 2.9.6.0 and I'm not able to log events from the sfportscan preprocessor using the unified2 file format. This is the conf (actually is the default one): preprocessor ...
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588 views

Snort not showing dropped/blocked packets

This question is about SNORT- I m basically trying to detect PING FLOOD attack. I have included the rule**(drop icmp any any -> any any (itype:8; threshold, track by_src, count 20, ...
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23 views

Detecting Spamming activities of Botnets

Remarks Hello Everyone,thanks for being a nice platform for expressing Everyone's Doubts/Views. Problem Statement I want to detect spamming activity of botnets Background Information about ...
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21 views

Snort matching against single packets

For a specific task, I'd like to match snort rules against the first 1-2 packets of each flow in the network without waiting for the other subsequent flow packets. Can I do this with snort? If so, ...
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127 views

Suricata IPS manual blocking/unblocking vs. snort and guardian

Does anyone have experience with using Suricata as an IPS? Im on Debian and I'd like to be able to manually block and unblock specific ip addresses (iptables). I've not used Suricata as I am currently ...
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63 views

Snort arpspoof preprocessor not giving alerts

I'm attempting to use Snort to detect a simple arpspoof attack on a test network I've set up. I have the following 4 ip addresses on this network. 192.168.1.1 Router 00:18:39:EC:F5:78 192.168.1.2 ...
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56 views

Snort rule to detect More Fragments fragbit not working

I have a Virtualbox setup with Snort running on a Windows 7 host and Kali Linux as the attacking machine, connected on an internal network. I'm investigating ways to get Snort to detect fragmentation ...
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68 views

Switching from Snort rules to Emerging Threats. Is there a way to know which ET rule sid covers the same vulnerabilty as Snort rule sid?

Our company has been using the snort community rules and we have tuned our rule files over years to our specific needs. Now our company has decided to use Emerging Threats (ET) open rules. The ET ...
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95 views

Snort rule does not work when combining “content” fields

I'm trying to write a snort rule which outputs an alert whenever a web server returns an HTML document containing a specific string. I've come up with the following rule: alert tcp any any -> any ...
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366 views

problem with my snort rule

I have written this rule but when I try to reload Snort it is failing. I have commented out the rule and reloaded snort; it is working so I know it's the rule. alert tcp any any -> any 5466 ...
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50 views

Possible to run snort without modifiers?

Is there anyway (e.g some command line argument) with which we can tell snort to run and perform detection but without caring for the rule modifiers if there are any ? e.g alert tcp any any -> ...