js/fortonight.qen是什么病毒

This script virus resides on web pages - they are many different ones. When users visit one of those pages, a link to a pay-per-click webpage was appended to their email signature file. When an infected user manually sent out an email message, a link would appear at the bottom, pointing to a web page on this site. The link is included in an IFrame, so if the receiving e-mail client supported HTML, the page would open automatically, and be displayed inside the e-mail message.

The Internet Explorer and Netscape Navigor home page settings are also changed by this script.

Some of those web pages have already been removed; therefore this virus may not always be a threat. However, users may see this detection in messages sent from infected users.

该病毒是网页内嵌型病毒，mcafee病毒定义文件4200以上都可以杀掉，但因为只在你访问包含该病毒的网页时才出现，所以会时不时的报警，并非mcafee杀不掉，若你正在浏览这样的网页，仍会出现报警滴

一般浏览网页时会有,只要杀毒软件发现了,一般没什么问题.
这种病毒很常见,多是黑客注入到网站里的.