[Snort-sigs] Help with a signature

Jamie Riden jamie.riden at ...2420...
Sat Sep 15 10:22:43 EDT 2012


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 at ...3732...> 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.com%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****
>
>
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-- 
Jamie Riden / jamie at ...3509... / jamie.riden at ...2420...
http://uk.linkedin.com/in/jamieriden
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