SOUTHFIELD Computer Associates on Tuesday raised the threat assessment for two worms now sweeping the world, the Bagle and Mydoom variants. CA said individual virus incidents and the number of variants encountered by home and business users is climbing alarmingly.

With five Bagle variants in six days, several new techniques and the re-emergence of Mydoom, there is an intense threat environment across the Internet, said Sam Curry, vice president of eTrust security management at CA. There is also increased probability that a new variant of the Netsky worm may emerge as the original race to Z was between Bagle and Netsky. Internet users should protect themselves and stay up-to-date for their own safety and to help ensure the overall safety of the Internet.

CAs Security Advisor, which quickly researches and responds to global threats via a network of rapid response centers around the world, says counts for the following in the wild viruses are rising dramatically:

Win32.Bagle.AE (High) a.k.a. Bagel.AH, Bagel.AI and Beagle.AG.

Win32.Bagle.AB (Medium) Bagel.AF, Beagle.AB.

Bagle.AC (Medium) a.k.a. Bagel.AH and Bagel.AG by other antivirus vendors.

Mydoom.N (Medium)

Duts (Low) a.k.a. Dust and Dtus, a mobile virus and the first to affect Windows CE.

Several of these viruses represent blended or hybrid threats, employing many techniques to deliver their payloads. Internet users are advised to be wary of unusual emails, especially those that are out-of-character from the sender and to not inherently trust any attachments.

For additional information, please visit http://www3.ca.com/securityadvisor/.