One analyst, Jack Gold of J. Gold Associates, said in an interview that NetQin had not specifically said in its statement this week or in the prospectus that it never uploaded malware, directly or indirectly, with its legitimate software.

"Maybe I am getting too skeptical in my old age, but NetQin didn't actually say that they didn't load a malware stub on the product and then make people pay to get it removed."

He said it would be interesting to hear Research in Motion's reaction to the antivirus software for BlackBerry announced by NetQin this week. RIM did not respond to a request to comment.

Matt Hamblen covers mobile and wireless, smartphones and other handhelds, and wireless networking for Computerworld. Follow Matt on Twitter at or subscribe to . His e-mail address is .

in Computerworld's Mobile and Wireless Topic Center.