Symantec Corp. will add a new defense to its consumer security flagship products Norton AntiVirus and Norton Internet Security early next month to protect PCs from zero-day exploits, the company said Wednesday.

Sonar, for Symantec Online Network for Advanced Response, is based on
technology acquired in the 2005 purchase of WholeSecurity, a
Texas-based maker of anti-phishing and intrusion prevention
software. “It’s a new behavioral technology,” says Ed Kim, director of
product management in Symantec’s consumer product group. “It’s a
zero-day defense that doesn’t use signatures.”