[Snort-users] Alert on Max connections per IP

Argcyborg argcyborg at ...11827...
Mon Jun 6 22:10:19 EDT 2016


I already use that in my rule with no luck.

alert tcp $EXTERNAL_NET any -> 192.168.1.50 4000 ( msg:"Deteccion de
conexiones"; flow:established,to_server; content:"|0d 00 00 00 50 cc 5d ed

b6 19 a5 91 00|"; nocase; rawbytes; detection_filter: track by_src, count 2,
seconds 60; sid:1000050; rev:1;)

 

If I quit detection_filter the rule works detecting the content, but with
the detection_filter doesn't.

I don't know what to do.

 

Thanks again !

 

 

-----Mensaje original-----
De: Al Lewis (allewi) [mailto:allewi at ...589...] 
Enviado el: lunes, 6 de junio de 2016 20:03
Para: Argcyborg; wkitty42 at ...14940...; snort-users at lists.sourceforge.net
Asunto: RE: [Snort-users] Alert on Max connections per IP

 

Section on thresholding:

 

See the section on the detection filters.

 

 
<http://manual-snort-org.s3-website-us-east-1.amazonaws.com/node34.html#dete
ction_filter>
http://manual-snort-org.s3-website-us-east-1.amazonaws.com/node34.html#detec
tion_filter

 

 

1)  track by the source - source IP match

2)  count  - number of rule matching in seconds that will cause event_filter
limit to be exceeded. 

3 ) within 60 seconds - within the time specified

 

 

The third packet that matches the source IP will trigger an alert if within
the 60 second time period.

 

 

 

Albert Lewis

QA SNORT/Sourcefire

SOURCEfire, Inc. now part of Cisco

9780 Patuxent Woods Drive

Columbia, MD 21046

Phone: (office) 443.430.7112

Email:  <mailto:allewi at ...589...> allewi at ...589... 

 

-----Original Message-----

From: Argcyborg [ <mailto:argcyborg at ...11827...> mailto:argcyborg at ...11827...]

Sent: Monday, June 06, 2016 6:40 PM

To:  <mailto:wkitty42 at ...14940...> wkitty42 at ...14940...;
<mailto:snort-users at lists.sourceforge.net> snort-users at lists.sourceforge.net

Subject: Re: [Snort-users] Alert on Max connections per IP

 

Hi, if I use this rule, what be the threshold two config?

alert tcp $EXTERNAL_NET any -> 192.168.1.50 4000 ( msg:"Deteccion de
conexiones"; flow:established,to_server; content:"|0d 00 00 00 50 cc 5d ed

b6 19 a5 91 00|"; nocase; rawbytes; detection_filter: track by_src, count 2,
seconds 60; sid:1000050; rev:1;)

 

Thanks again!

 

-----Mensaje original-----

De:  <mailto:wkitty42 at ...14940...> wkitty42 at ...14940... [
<mailto:wkitty42 at ...14940...> mailto:wkitty42 at ...14940...] Enviado el:
domingo, 5 de junio de 2016 20:41

Para:  <mailto:snort-users at lists.sourceforge.net>
snort-users at lists.sourceforge.net

Asunto: Re: [Snort-users] Alert on Max connections per IP

 

On 06/05/2016 05:39 PM, Argcyborg wrote:

> Hi, is there a way to alert or drop when receive more than 8 

> connections

per ip

> to an specific port ?

 

that's called thresholding...

 

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What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic
patterns at an interface-level. Reveals which users, apps, and protocols are
consuming the most bandwidth. Provides multi-vendor support for NetFlow,
J-Flow, sFlow and other flows. Make informed decisions using capacity
planning reports.
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