[Oisf-users] fast.log fields and vrt rules question

[mouna amani]

I got the following line in my fast.log

07/05/2013-20:33:47.183109  [**] [1:2101201:10] GPL WEB_SERVER 403
Forbidden [**] [Classification: Attempted Information Leak] [Priority:
2] {TCP} 192.168.50.3:80 -> 192.168.50.55:16476

 I would like to know what each field means :) any link will be helpful

I would like to use emmerging rules + VRT rules
what url should I add to my oinkmaster.conf to download VRT rules ???
thanks :)