From the interview:
PCW: Exactly what private information is really transmitted with spyware–and is this information that is willingly (although unknowingly) entered by users, or is there spyware that really extracts things deep in a system’s Registry and then transmits them to advertisers?
Kolla: It doesn’t have to go deep into the Registry. The most common things transmitted are the URLs of pages that a user visits; sometimes even data the user enters into a form on a Web site.
PCW: How do you guys find new spyware? Do people come to you and say, “My computer’s behaving strangely and I think it’s spyware,” or do you actively go out looking for it or both?
Kolla: Kind of both. People usually go to a bunch of support places all over the Internet and, well, we just go there, ask them to create some kind of system report, and from that, we request some files.
Read the full story at PC World.