[Bro] How to write a signature definition for (event_A AND event_ B)?

Bogdan Koziol robtobfli at gmx.net
Tue Oct 21 14:42:19 PDT 2008

Hallo everybody,

I'm a new and unexperienced user of the really interesting BRO detection
framework. I want to write a signature definition for event A and B, which
triggers only after event A and B happend. My approach so far:

signature s1 {event "Pattern A"}

signature s2 {event "Pattern B"
   requires-signature s1

If i understood the documentation correctly, i can define an event sequence
with the "requires-signature" condition. 

But this one only matches events (A, B) and not (B, A).

Is it possible to write an event expression (A AND B)?

Kind regards,

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