Re: configuring rules

["Joel Esler (jesler)" <jesler () cisco com>]

Yes.

http://manual.snort.org/node53.html

--
Joel Esler
Open Source Manager
Threat Intelligence Team Lead
Talos

On Sep 2, 2014, at 12:50 PM, Sharif Uddin <Sharif.Uddin () spectrumasa com<mailto:Sharif.Uddin () spectrumasa com>> 
wrote:

Is it possible to have multiple ip addresses instead of just networks in

ipvar HOME_NET

From: Joel Esler (jesler) [mailto:jesler () cisco com]
Sent: 02 September 2014 17:17
To: Sharif Uddin
Cc: snort-users () lists sourceforge net<mailto:snort-users () lists sourceforge net>
Subject: Re: [Snort-users] configuring rules

Dear Sharif,

Thanks for your email.  I believe you will find what you are looking for 
here:http://manual.snort.org/node31.html#SECTION00446000000000000000

--
Joel Esler
Open Source Manager
Threat Intelligence Team Lead
Talos


On Sep 2, 2014, at 12:05 PM, Sharif Uddin <Sharif.Uddin () spectrumasa com<mailto:Sharif.Uddin () spectrumasa com>> 
wrote:


How would I add classification, severity on custom alerts?



From: Joel Esler (jesler) [mailto:jesler () cisco com]
Sent: 02 September 2014 16:49
To: Sharif Uddin
Cc: snort-users () lists sourceforge net<mailto:snort-users () lists sourceforge net>
Subject: Re: [Snort-users] configuring rules

It appears that all of your rules are bi-directional.  “<>”.  Try making them single directional “->”

--
Joel Esler
Open Source Manager
Threat Intelligence Team Lead
Talos

On Sep 2, 2014, at 11:41 AM, Sharif Uddin <Sharif.Uddin () spectrumasa com<mailto:Sharif.Uddin () spectrumasa com>> 
wrote:



Hello


I needs some help in writing some rules to test my network.


I have set up snort, barnyard2, snorby on centos 7


My home network is

ipvar HOME_NET 
[172.16.0.0/22,172.16.12.0/24,172.16.13.0/24,31.221.13.192/29,62.49.167.0/29,62.49.167.8/29,192.168.254.0/24,192.168.202.0/24,192.168.218.0/24,10.0.2.0/24,10.0.3.0/24,192.168.15.0/24,172.16.64.0/18,172.16.15.0/24,172.16.16.0/22,10.0.0.0/24,10.0.1.0/24,192.168.252.0/24,172.16.171.0/24,10.40.135.0/24,172.16.8.0/24,172.16.9.0/24,192.168.0.0/24,172.0.0.0/24,105.0.0.0/24,192.168.1.1/24,192.168.224.0/20,212.103.166.96/30]



The following are some test rules which I put in local.rules


alert icmp !$HOME_NET any <> $HOME_NET any (msg:"ICMP"; sid: 1000001; rev:1;) # external ping to internal network?
alert tcp $HOME_NET any <> $HOME_NET any (content:"|00 01 86 a5|"; msg:"mountd access";sid:1000002;rev:1;)  # found a 
sample online which has not responded to anything
alert tcp !$HOME_NET :139 <> $HOME_NET any (msg:"NetBIOS Session";sid:1000003;rev:1;) # test external ip trying to mount
alert tcp !$HOME_NET :445 <> $HOME_NET any (msg:"SMB over TCP";sid:1000004;rev:1;) # test external ip trying to mount


Have I written them correctly?


For my samba alerts I have found it also includes internal network, when I look at the source port on snorby, its not 
always 139 or 445. What am I doing wrong?



Sharif





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