util.sh
The util.sh shell script can add a log file to be monitored by ossec-logcollector.  It can also add a full_command to check for changes to a website, or for changes to the nameserver of a domain.
A blogpost from Daniel Cid (for 3WoO) introduced this utility.
addfile <filename> [<format>]  | 
Add a log file to be monitored by ossec-logtest A local file will be added to the ossec.conf  | 
addsite <domain>  | 
Monitor a website for changes. A  A rule can be written to monitor this output for changes. Requires lynx  | 
adddns <domain>  | 
Monitor the nameserver of a domain for changes. A   | 
Note
addsite may not be useful on pages with dynamic content.
Note
addns Requires the host command.