Trend Micro issued three outbreak warnings in May, with its first red-alert warning over the Sasser worm attack, followed by two yellow alerts raising caution to the Sasser A variant and Wallon A worms. The company says the surge of worm outbreaks illustrates the need to have updated operating systems and applications, and also to have the appropriate Microsoft security patches installed. Trend Micro also reiterated the warning that "traditional antivirus solutions alone can no longer deal with these threats," saying companies need to implement "holistic" solutions to combat the evolving threats online. Dahlgren says the focus for corporations now is to identify their vulnerabilities and keep ahead of the hackers. "It's a matter of addressing the old vulnerabilities and identifying the new," she said, adding "it's a more complex issue than just employing an antivirus software solution; it's about asset management more than anything else."