Unknown to users, the worm connects their PC to a custom IRC channel when they are logged on to a remote server while surfing the Web or reading e-mail.

CNN: New 'Trojan Horse' strain may go mainstream

Open source software such as Apache Web server and the Linux server operating system have become popular systems to run not only on network servers, but also on server appliances (servers dedicated to single tasks such as e-mail and Web site hosting).

CNN: Red Hat to support "all things open source"