I have constantly high outgoing traffic. Do i have a worm?

There are two possibilities to determine the source of the huge traffic:

• See the current connections within Status > Connections and try to figure out if there is an ip address which causes a bunch of connections more than usual.
  
  
• Enable traffic monitoring within Services > Traffic Monitoring.
  This tool is able to record the connections which go through the firewall and create statistics and reports about each ip address of your internal network. So you can easily determine the ip address which causes the most traffic.

Most probably the reason of the high traffic is to be found on the machine which causes the most traffic.

The daily "Log Summary" under the "Firewall" section can also assist in determining the hosts as well as ports involved.