[Bro] Use BRO as an offline L7-filter

vcarela vcarela at ac.upc.edu
Mon Nov 10 07:19:36 PST 2008

Hi list,

I'm trying to use BRO as an offline L7-filter. I would like to add a
signature file to BRO (maybe to the DPD "module"??) and run on a trace
to detect the applications. I have already written the signature file
based on J. Erman thesis (last pages of
http://www.cse.iitd.ernet.in/~mahanti/papers/erman.msc.thesis.pdf ).

Now I'm a bit lost, where I have to copy the signatures? 

 here? -> /usr/local/bro/share/bro/sigs/jerman.sig 

Which file I have to modify to add my signatures and remove the rest?
Because when I run :
        " bin/bro -r trace.pcap dpd "
I get outputs like:

        " 1217419201.228065 weird: spontaneous_FIN
          1217419201.234297 weird: spontaneous_RST  "

I only want to get the l7 application detected. I don't care for the
snort or other alerts with no relation with l7 applications. 

Thank you in advance,

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