According to the analysis conducted by U.K.-based security vendor Sophos, Farid Essebar, 18, also known as "Diabl0," may have written 20 variations of the Mytob mass-mailed worm and one version of ...

Only one new threat, Mytob-Z, broke into the top 10 in April, making its debut at No. 7. "During the month of April, several older viruses maintained their spot on the chart," Gregg Mastoras ...