**Phase 1: Completed pre-decoding.
       full event: 'May 26 20:16:17 lili sudo: dcid : TTY=pts/1 ; PWD=/home/dcid ; USER=root ; COMMAND=/usr/bin/vi /etc/sudoers'
       hostname: 'lili'
       program_name: 'sudo'
       log: 'dcid : TTY=pts/1 ; PWD=/home/dcid ; USER=root ; COMMAND=/usr/bin/vi /etc/sudoers'

**Phase 2: Completed decoding.
       decoder: 'sudo'

**Phase 3: Completed filtering (rules).
       Rule id: '5403'
       Level: '4'
       Description: 'First time user executed sudo.'
**Alert to be generated.