User Guide - Kaspersky Lab

CHAPTER 9. WEB ANTI-VIRUS
Whenever you use the Internet, information stored on your computer is open to
the risk of infection by dangerous programs, which can penetrate your computer
when you read an article on the Internet.
Web Anti-Virus is Kaspersky Internet Security’s component for guarding your
computer during Internet use. It protects information that enters your computer
via the HTTP protocol, and also prevents dangerous scripts from being loaded
on your computer.
Warning!
Web Anti-Virus only monitors HTTP traffic that passes through the ports listed on
the monitored port list (see 19.5 on pg. 262). The ports most commonly used for
transmitting email and HTTP traffic are listed in the program package. If you use
ports that are not on this list, add them to it to protect traffic passing through
them.
If you are working on an unprotected network, you are advised to use Web Anti-
Virus to protect yourself while using the Internet. Even if your computer is
running on a network protected by a firewall or HTTP traffic filters, Web Anti-
Virus provides additional protection while you browse the Web.
The component’s activity is indicated by the Kaspersky Internet Security system
tray icon, which looks like this whenever scripts are being scanned.
Let’s look at the component’s operation in more detail.
Web Anti-Virus consists of two modules, that handle:
• Traffic scan – scans objects that enter the user’s computer via HTTP.
• Script scan – scans all scripts processed in Microsoft Internet Explorer, as
well as any WSH scripts (JavaScript, Visual Basic Script, etc.) that are
loaded while the user is on the computer.
A special plug-in for Microsoft Internet Explorer is installed as part of
Kaspersky Internet Security installation. The button in the browser’s
Standard Buttons toolbar indicates that it is installed. Clicking on the icon
opens an information panel with Web Anti-Virus statistics on the number
of scripts scanned and blocked.
Web Anti-Virus guards HTTP traffic as follows:
1. Each web page or file that can be accessed by the user or by a certain
application via HTTP is intercepted and analyzed by Web Anti-Virus for