Can someone explain how does ossec agent in an active response config 
detects or responds to events (e.g scan attempt on web-server 404 status 
code).

I know that the below xml block at the server ends fire up the response on 
agent end. But all the rules are kept in /root dir not the usual 
installation dir for the agent. Apart from it monitoring the apache access 
logs it doesn't have a script or regex that tells us what status code to 
check.

Is it something that is shared on the fly between client and server using 
udp port 1514? Kindly help me understand it.
!-- Active response to block http scanning --> 
    <active-response> 
        <command>route-null</command> 
        <location>local</location>
    <!-- Multiple web server 400 error codes from same source IP --> 
        <rules_id>31151</rules_id> 
        <timeout>600</timeout> 
    </active-response>


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