Are you referring to Ahnlab?
I'm convinced that Ahnlab's virus scanner software is itself a form of spyware. Wouldn't surprise me at all if it has been used as an attack vector.
Ahnlab is a much more respectable company, and I have yet to hear of a major security incident where Ahnlab software was implicated. Their V3 line of software are clearly not the best in the industry, but I would be very surprised if they were any worse than other antiviruses.
Edit: According to the latest news, today's malware was disguised as a component of an antivirus program sold by Hauri, Inc. (하우리)