Re: Help with a signature

[Jamie <jamie.riden () gmail com>]

Argh, sorry. I will go and read the current manual as penance :) 

Sent from a mobile device


On 15 Sep 2012, at 21:56, Alex Kirk <akirk () sourcefire com> wrote:

> Actually, you just want to use http_uri as a modifier to the content match. uricontent is long since deprecated.
>
> Also, given that I see your PCAP is missing bytes, you might want to try on a more complete PCAP. You may be running 
> into confusion with the stream or http preprocessors, which could be discarding the incomplete request.
>
> On Sep 15, 2012 10:25 AM, "Jamie Riden" <jamie.riden () gmail com> wrote:
> Not exactly sure why this didn't match, but you should try uricontent instead of content - it's normalised by the 
> http_preprocessor. 
>
> I believe there are some bleeding edge rules which match on =http if you want to compare - it's a more general RFI 
> signature. 
>
> cheers,
>  Jamie 
>
> On 14 September 2012 14:06, Wilson, Dave <Dave.Wilson () wwt com> wrote:
> Hello,
>
>  
>
> I'm trying to create a snort rule that will alert on traffic that contains "rfihub" as part of the url.  Here is an 
> example of the TCP stream of a packet that I'd want to alert on.
>
>  
>
> 00000000  47 45 54 20 2f 63 6d 3f  70 69 64 3d 32 30 37 36        GET /cm? pid=2076
>
> 00000010  32 35 30 66 2d 39 32 63  32 2d 34 65 63 64 2d 39      250f-92c 2-4ecd-9
>
> 00000020  30 34 33 2d 63 63 36 33  65 65 36 63 34 35 37 37      043-cc63 ee6c4577
>
> 00000030  26 64 73 74 3d 68 74 74  70 25 33 41 25 32 46 25      &dst=htt p%3A%2F%
>
> 00000040  32 46 70 2e 72 66 69 68  75 62 2e 63 6f 6d 25 32       2Fp.rfih ub.com%2
>
> 00000050  46 63 6d 25 33 46 69 6e                                               Fcm%3Fin
>
> 00000058  5b 31 32 37 32 20 62 79  74 65 73 20 6d 69 73 73      [1272 by tes miss
>
> 00000068  69 6e 67 20 69 6e 20 63  61 70 74 75 72 65 20 66      ing in c apture f
>
> 00000078  69 6c 65 5d                                                                      ile]
>
> 0000007C  61 74 68 65 72 2e 63 6f  6d 25 32 46 6d 61 6e 61      ather.co m%2Fmana
>
> 0000008C  67 65 64 66 65 25 32 46  6d 61 6b 65 52 65 71 75     gedfe%2F makeRequ
>
> 0000009C  65 73 74 2d 6d 61 78 2e  68 74 6d 6c 25 33 46 70     est-max. html%3Fp
>
> 000000AC  6f 73 25 33 44 57 58 5f  54 6f 70 33 30 30 56 61       os%3DWX_ Top300Va
>
> 000000BC  72 69 61 62 6c 65 26 70  66 3d 0d 0a 43 6f 6f 6b       riable&p f=..Cook
>
> 000000CC  69 65 3a 20 69 3d 65 31                                            ie: i=e1
>
> 00000000  48 54 54 50 2f 31 2e 31  20 33 30 32 20 4f 4b 0d        HTTP/1.1  302 OK.
>
> 00000010  0a 43 6f 6e 74 65 6e 74  2d 54 79 70 65 3a 20 74       .Content -Type: t
>
> 00000020  65 78 74 2f 68 74 6d 6c  3b 20 63 68 61 72 73 65       ext/html ; charse
>
> 00000030  74 3d 75 74 66 2d 38 0d  0a 50 33 50 3a 20 43 50      t=utf-8. .P3P: CP
>
> 00000040  3d 22 43 55 52 20 41 44  4d 20 4f 55 52 20 4e 4f        ="CUR AD M OUR NO
>
> 00000050  52 20 53 54 41 20 4e 49                                            R STA NI
>
>  
>
>  
>
> Here is the rule I put together:
>
>  
>
>  
>
> alert tcp any any -> any any (msg:"Zeroaccess variant"; content:"|72 66 69 68 75 62|" sid:1000001;)
>
>  
>
>  
>
> When feed the pcap into snort, It'll process it, but not alert.  I've tried changing the protocol from tcp to http, 
> but snort chokes and tells me "Bad Protocol: http"
>
>  
>
> I'm still very new at writing snort rules, so I apologize in advance for any helpful details I've left out.  I really 
> appreciate any assistance...thank you.
>
>  
>
> Dave
>
>
> ------------------------------------------------------------------------------
> How fast is your code?
> 3 out of 4 devs don\\\'t know how their code performs in production.
> Find out how slow your code is with AppDynamics Lite.
> http://ad.doubleclick.net/clk;262219672;13503038;z?
> http://info.appdynamics.com/FreeJavaPerformanceDownload.html
> _______________________________________________
> Snort-sigs mailing list
> Snort-sigs () lists sourceforge net
> https://lists.sourceforge.net/lists/listinfo/snort-sigs
> http://www.snort.org
>
>
> Please visit http://blog.snort.org for the latest news about Snort!
>
>
>
> -- 
> Jamie Riden / jamie () honeynet org / jamie.riden () gmail com
> http://uk.linkedin.com/in/jamieriden 
>
>
>
>
> ------------------------------------------------------------------------------
> How fast is your code?
> 3 out of 4 devs don\\\'t know how their code performs in production.
> Find out how slow your code is with AppDynamics Lite.
> http://ad.doubleclick.net/clk;262219672;13503038;z?
> http://info.appdynamics.com/FreeJavaPerformanceDownload.html
> _______________________________________________
> Snort-sigs mailing list
> Snort-sigs () lists sourceforge net
> https://lists.sourceforge.net/lists/listinfo/snort-sigs
> http://www.snort.org
>
>
> Please visit http://blog.snort.org for the latest news about Snort!
------------------------------------------------------------------------------
Everyone hates slow websites. So do we.
Make your web apps faster with AppDynamics
Download AppDynamics Lite for free today:
http://ad.doubleclick.net/clk;258768047;13503038;j?
http://info.appdynamics.com/FreeJavaPerformanceDownload.html

_______________________________________________
Snort-sigs mailing list
Snort-sigs () lists sourceforge net
https://lists.sourceforge.net/lists/listinfo/snort-sigs
http://www.snort.org


Please visit http://blog.snort.org for the latest news about Snort!