Re: [help,urgent] Using PCRE to match packets in hex

[Jeremy Hoel <jthoel () gmail com>]

Without a pcap of the data you're trying to hit on its hard to tell.. but
this section mentions you might want a content part of the rule also.

http://manual.snort.org/node32.html#SECTION004523200000000000000
On Oct 27, 2013 12:43 PM, "Yoyo Lam" <mtcyoyo () gmail com> wrote:

> Hello experts,
>
> I have a problem about PCRE. I wrote a PCRE pattern that perfectly matches
> a certain message, and I checked in some regex checker and there is no
> problem. But when I put it in a Snort rule with the B modifier, it doesn't
> work. Please help me to figure what happened.
>
> The PCRE Check page:
> http://www.phpliveregex.com/p/1In
>
> My Snort rule:
> alert tcp any any -> any any
> (pcre:"/([0-9a-fA-F]{2})13([0-9a-fA-F]{2}){8}(77696e646f7773|6c696e7578)/B";
> msg:"Some message"; sid:1234567; rev:1;)
>
> Please help me by either
> 1) Telling me what I have forgotten to add/change/remove;
> 2) Give me the working rule :D
> 3) Any way that can solve this fast
>
> This is quite urgent, so please help me asap.
>
> Best regards,
> Yoyo
>
>
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