Bundling is one of the most common ways parasites are spread. It works like this: you install a piece of software you think looks good, and it invites some of its friends onto your computer behind your back.

7FaSSt is an IE toolbar providing a search field which queries the engine 7search.com.

An ActiveX control that drops diallers onto the host system.

The ActualNames software is an address bar search hijacker targeting IE, Netscape and AOL browsers.

An ActiveX control that downloads and installs files.

AdBreak consists of a Browser Helper Object which opens pop-up advertising as you use Internet Explorer, and a task run at startup which highjacks your home page, search and error pages to point to AdBreak's servers.

An program that adds links to porn and other sites to the Internet Explorer Favorites menu. Whilst it is installed, it can add more links when directed to do so by a web page.

AproposMedia is the advert-showing part of the 'PeopleOnPage' program, an Internet Explorer sidebar which claims to show a list of other users of the current site.

Aornum is a task started with Windows which keeps in contact with its controlling servers, combined with an IE Browser Helper Object.

ASpam is remote access trojan implemented as an IE Browser Helper Object. It is not really Unsolicited Commercial Software as it has no known commercial aim, but it is included in the detection script at this site as it is a threat detectable from web pages.

AutoSearch is an IE Browser Helper Object that hijacks address-bar searches. It knows about some of the other prevalent search-hijackers

Bargain Buddy consists of an IE Browser Helper Object, and a process set to run at startup. The BHO monitors web pages requested and terms entered into forms. If there is a match with a preset list of sites and keywords, an advertisement may be shown. The process can contact its maker's server to download updates to the list of adverts and to the software itself.

A player for 'rich media' advertising.

BookedSpace is an Internet Explorer Browser Helper Object used to show advertising.

BrowserAid is a manufacturer of various Internet Explorer toolbars, most of which seem to be installed sneakily.