Re: Signature Lookup Confusion

[Josh Bitto <jbitto () onlineschool ca>]

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
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