clamscan problem

Hi

We currently found when clamscan is running on our server,it slows down the server. The CPU was 70-80%. The command is /usr/bin/clamscan, but I can't found it in scheduled cron jobs, how did it get triggered?

Here are the server details:
Operating system Debian Linux 4.0
Webmin version 1.410
Virtualmin version 3.55 (Pro)

Status: 
Closed (fixed)