where are message: Message meets Alert condition Virus/Worm detected:

I would like to change the content of the default messag that is warning about viruses.

The messag starts typical  with the line:  

Message meets Alert condition

Virus/Worm detected:

We have a redundant set of fortigates 201E with firmware 6.0.6

Would anybody know where to find the default message and how i can change the default so the username involved in the virus attack is being displayed in the warning email.

Regards

Gerard