Again, DCU’s research shows there may be close to 1 million computers infected with Rustock malware, all under the control of the person or people operating the network like a remote army, usually without the computer’s owner even aware that his computer has been hijacked. Bot-herders infect computers with malware in a number of ways, such as when a computer owner visits a website booby-trapped with malware and clicks on a malicious advertisement or opens an infected e-mail attachment. Bot-herders do this so discretely that owners often never suspect their PC is living a double life.
Taking Down Botnets: Microsoft and the Rustock Botnet (2011-03-17) By Richard Boscovich. @ Source blogs.technet.com
booby-trapped = An explosive device designed to be triggered when an unsuspecting victim touches or disturbs a seemingly harmless object.
Ooops, keeps posting to the wrong blog. If case you are wondering, this is WordyEnglish, a-word-a-day kinda thing at http://wordy-english.blogspot.com/