http://en.wikipedia.org/wiki/Yahoo!_Assistant
Yahoo! Assistant
From Wikipedia, the free encyclopedia
Yahoo! Assistant, formerly named 3721 Internet Assistant, is a Browser Helper Object for Internet Explorer developed by Beijing 3721 Technology Co. Ltd, and was renamed to Yahoo! Assistant after Beijing 3721 Technology was acquired by Yahoo!.
3721 Internet Assistant, together with 3721 Chinese Keywords, are known as Spyware by Microsoft AntiSpyware, and malware or Browser Hijacker by some others, such as Panda.
Contents
1 Distrubution
2 Features
2.1 Blocking popup ads
2.2 Internet Explorer Extension Management
2.3 Concealing
3 Uninstall
4 Step to block 3721 websites
5 External links
Distrubution
3721 Internet Assistant was originally released as a normal client-server application. However, it turned to use ActiveX technology to install itself on client system later and was also shipped with many sharewares as default install options. 3721 Internet Assistant was also accursed for its using of a flaw in Microsoft Internet Explorer to install itself automatically when a user is browsing a wide array of 3721 sponsored personal and commercial websites with Microsoft Internet Explorer. Yahoo! Assistant is also included in 3721 Chinese Keywords and Yahoo! Mail Express, but sometimes the whole package of Internet Assistant, Chinese Keywords and Mail Express is named "Yahoo! Assistant" in some sharewares.
Uninstall
3721 Internet Assistant, together with 3721 Chinese Keywords, according to Interfax, are regarded by Chinese internet users as "Hooligan" or "Zombie" applications. The uninstall program of the pair provided by 3721 simply redirects users to the 3721 website (in Simplified Chinese thus not recognizable except by Chinese speakers), and the default option of the web page is to keep 3721 Internet Assistant after the uninstallation. After following the web uninstallation wizard and a reboot, many 3721 files will still remain on the client system. The pair were ranked #1 by Beijing Association of Online Media in its list of Chinese Malware at 2005.
Because the pair used several kernel technologies to protect themselves, it is very difficult for many anti-spyware applications or IT professionals to remove them completely. For example, a driver named CnsMinKP.sys/vxd is installed with them and loaded even in Windows safe mode, and many kinds of attempts that try to remove 3721 files or registrys will be circumvented by this driver. For another, an incomplete uninstallation will trigger the "self-repair" feature that downloads missing files from internet. As a result, Microsoft AntiSpyware will enter an infinite loop when it is trying to remove the 3721 applications.