Re: real-time alerting and rule to monitor only specific traffic

[Y M <snort () outlook com>]

The ":" is used for specifying port ranges, so in your log rule you are basically negating all ports from 80 all the 
way to 443. You may be want to do something like ![80,443] to specify two individual ports, plus negation.
If you want to completely not inspect destination TCP on ports 80 and 443, then BPF is the way to go.
From: lokanovic () flightapps com
To: allewi () cisco com; snort-users () lists sourceforge net
Date: Thu, 26 Feb 2015 18:24:24 +0000
Subject: Re: [Snort-users] real-time alerting and rule to monitor only specific traffic








​Does this look correct if i'm trying to exclude traffic on port 80 and 443 from being logged?



alert tcp any any -> any any (msg:"TCP testing rule";sid:1000001;)
log tcp any any -> 10.0.90.0/24 !80:443



This is from my local rules file.






Thank you,



Lena Okanovic
lokanovic () flightapps com




From: Al Lewis (allewi) <allewi () cisco com>

Sent: Monday, February 23, 2015 5:45 PM

To: Lena Okanovic; snort-users () lists sourceforge net

Subject: RE: [Snort-users] real-time alerting and rule to monitor only specific traffic
 




You can filter that out by applying a bpf filter to the end of your command. Below I filtered out port 80 traffic. 
Without the filter I get alerts but with the filter
 I don’t even though the rule is “any to any” inside the conf file.

 

 

gecko:/var/tmp/snort-2.9.7.0-released # ./bin/snort -c etc/lena.conf -r etc/lena.pcap -A console:test -H -U -k none -q

1       1       1000001 0

2       1       1000001 0

3       1       1000001 0

gecko:/var/tmp/snort-2.9.7.0-released # ./bin/snort -c etc/lena.conf -r etc/lena.pcap -A console:test -H -U -k none -q 
not tcp port 80

gecko:/var/tmp/snort-2.9.7.0-released #

 

gecko:/var/tmp/snort-2.9.7.0-released # tcpdump -n -r etc/lena.pcap -c 1

reading from file etc/lena.pcap, link-type EN10MB (Ethernet)

11:11:28.852742 IP 10.5.40.95.36884 > 10.4.31.42.80: Flags [S], seq 2514493807, win 5840, options [mss 1460,sackOK,TS 
val 347823238 ecr 0,nop,wscale 7], length 0

gecko:/var/tmp/snort-2.9.7.0-released #

 

 

 

For the email alerts you can try sending messages to syslog and then emailing from there. Maybe someone else can chime 
in and help out with that.

 

 

 

Hope this helps!

 

 


Albert Lewis

QA Software Engineer

SOURCEfire, Inc.
now part of
Cisco

9780 Patuxent Woods Drive

Columbia, MD 21046 

Phone: (office) 443.430.7112

Email:
allewi () cisco com 


 



From: Lena Okanovic [mailto:lokanovic () flightapps com]


Sent: Monday, February 23, 2015 7:25 PM

To: snort-users () lists sourceforge net

Subject: [Snort-users] real-time alerting and rule to monitor only specific traffic



 

​Hello,
 
How can I only monitor TCP traffic that is not on port 80 or 443 or on our DMZ IP address? And also, can someone please 
provide
 me with instructions on how to setup real-time (email) alerting in Snort on Windows server box.
So, if 'bad' TCP traffic comes through, I would like to get an email right a way letting me know.
 
 


Thank you,
 
Lena Okanovic
lokanovic () flightapps com










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