Hackers use many methods to attack computers on the Internet. Viruses, including worms and trojans, are malicious computer programs that self-replicate and put copies of themselves into other executable code or documents on your computer. When a computer is infected, the virus can destroy files or record key strokes.

To help protect your network from viruses, you can purchase the Gateway AntiVirus subscription service. Gateway AntiVirus operates with the SMTP, IMAP, POP3, HTTP, FTP, Explicit, and TCP-UDP proxies. When a new attack is identified, the features that make the virus unique are recorded. These recorded features are known as the signature. Gateway AntiVirus˙uses signatures to find viruses when content is scanned by the proxy.