Bro: detectiong OS probes

ashley thomas athomas at
Thu Jul 12 14:59:33 PDT 2001


Lot of OS probes works by sending a combination of flags like

SFU12, SF12 etc and seeing how the OS behaves. I was wondering how to detect
these kind of probes using bro .

I know it can be done easily in the TCPConnection::NextPacket()
where you have the syn,fin,rst and other flags in separate variables.
Probably i could look for those pattern call the Weird().

But is that the way to go about it ? Or should the detection be done
at the bro-script level.


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