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Undertanding Signatures And then


     I am trying to understand how signatures work on the network security manager.  I am looking at the signature for the Micorosoft Windows DirectShow insecure library loading (in or outbound)

cve - 2011-0032


Whats happening is - im currently having multiple WS being alerted on this traffic BUT I dont understand how the signature is laid out.

For the signature set #6 It has 3 different signatures all with "AND THEN"  I dont understand the AND THEN part of it.  the reason being is because one packet that I exported ONLY shows me hitting the third row for that signature exactly.  (but the and then makes it look like that signature needs to hit all three hex values in one packet.) 

So is that "and then" really an OR?

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Reliable Contributor mjesmer
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Re: Undertanding Signatures And then

This is a good question. My first inclination is to say that it looks for condition 1, then 2, then 3 and triggers if all 3 are met.

However I can also make a case for it being an order of what to check for first to last...(1, 2, then 3) and trigger on any that are met.

Have you tried support on this question?

Re: Undertanding Signatures And then

This is correct. It ensures that once the criteria is met and then the following criteria, the signature will be matched and subsequent actions will be taken.

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