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Re: Signature Lookup Confusion
From: Josh Bitto <jbitto () onlineschool ca>
Date: Tue, 7 May 2013 11:02:14 -0700

Thanks everyone! Yes it does help....No I haven't been able to go get my pop yet.....I'm kinda panicking at the moment 
about this

2013-05-07T10:38:26-07:00 firewall snort[62223]: [1:2010645:9] ET POLICY User-Agent (Launcher) [Classification: A 
Network Trojan was Detected] [Priority: 1] {TCP}

I've tried to do a search to find the definition of it and see why this fired. I don't want to block something that 
might be a false positive. Although the above has no hint of being a false positive I want to act on this quickly. 

So I went here...
http://www.snort.org/search/

put in the 2010645...nothing came up.....put in the 1....nothing came up. That's my hang up right now is doing a search 
for reference of what a sid/gid happens....I want to be able to search it up and see by definition what is going on.



-----Original Message-----
From: waldo kitty [mailto:wkitty42 () windstream net] 
Sent: Tuesday, May 07, 2013 10:52 AM
To: snort-users () lists sourceforge net
Subject: Re: [Snort-users] Signature Lookup Confusion

On 5/7/2013 13:24, Josh Bitto wrote:
I'm having a bit of a problem fully grasping how to search up rules 
that have been fired.....

2013-05-07T10:14:05-07:00 firewall snort[62223]: [120:8:1] 
(http_inspect) INVALID CONTENT-LENGTH OR CHUNK SIZE [Classification: 
Unknown Traffic]
[Priority: 3] {TCP} 209.97.200.53:32459 ->  216.178.47.38:80


Ok so what I understand from the log is that rule 120 fired. Either I 
need

no sir... rule identifiers are in GID:SID:rev format... only the GID:SID are really necessary...

the above says Generator 120 fired its rule with SID 8...

Generator 120 is http_inspect...

its rule SID 8 is "INVALID CONTENT-LENGTH OR CHUNCK SIZE"...

these are not "normal" rules like the *.rules files you download... these rules are built into the processor...

some caffeine or it's a horrible Tuesday for me to comprehend this, 
but I'm just not getting it. The instructions on how to search for the 
group id and the sid for some reason are not sticking. Can someone 
dumb this down for me....I'm gonna run out and get a pop and hopefully 
come back to someone who has awesomely helped me out.

does the above help?

Basically I want to be able to search for explanations on whatever 
event happens so I can determine if I need to take action or not.

this is where you might need to break out a pcap viewing tool like wireshark so you can look at the content of the 
network traffic that triggered the rule... 
snort should have saved a pcap for you and this particular entry will likely be inside a large pcap containing other 
saved traffic from other alerts... you use the timestamp to determine the proper packet to look at and then work it 
from there...


FWIW: i've someone who is a client on a large Canadian cable network and they are getting hit by tons of these... we 
haven't yet determined why, though...

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------------------------------------------------------------------------------
Learn Graph Databases - Download FREE O'Reilly Book
"Graph Databases" is the definitive new guide to graph databases and 
their applications. This 200-page book is written by three acclaimed 
leaders in the field. The early access version is available now. 
Download your free book today! http://p.sf.net/sfu/neotech_d2d_may
_______________________________________________
Snort-users mailing list
Snort-users () lists sourceforge net
Go to this URL to change user options or unsubscribe:
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