I'm curious how "Firewall rules grouped" land in the firewall log.

Consider the log 

Sep 21 2015 05:35:12: %ASA-4-106023: Deny tcp src outside:3.1.33.7/56323 
dst inside:1.1.1.1/8891 by access-group "outside_access_inside" [0x0, 0x0]

Returns the following.....


**Phase 1: Completed pre-decoding.
       full event: 'Sep 21 2015 05:35:12: %ASA-4-106023: Deny tcp src 
outside:3.1.33.7/56323 dst inside:1.1.1.1/8891 by access-group 
"outside_access_inside" [0x0, 0x0]'
       hostname: 'lott-ossec'
       program_name: '(null)'
       log: 'Sep 21 2015 05:35:12: %ASA-4-106023: Deny tcp src 
outside:3.1.33.7/56323 dst inside:1.1.1.1/8891 by access-group 
"outside_access_inside" [0x0, 0x0]'

**Phase 2: Completed decoding.
       decoder: 'pix'
       id: '4-106023'
       action: 'Deny'
       proto: 'tcp'
       srcip: '3.1.33.7'
       srcport: '56323'
       dstip: '1.1.1.1'
       dstport: '8891'

**Phase 3: Completed filtering (rules).
       Rule id: '4100'
       Level: '0'
       Description: 'Firewall rules grouped.'


How do these connections make it into the firewall.log file???  

I'm trying to tune ossec and could use some guidance.

Thank you!

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