In its biannual Security Intelligence Report released Monday, Microsoft said worms have become a greater threat in 2009, with the number of infections doubling from the second half of 2008 through the first half of 2009. Worms rose from the fifth most common threat online to second, behind Trojans. A major factor for the spike was the Conficker worm, which caused a small panic leading up to April 1 – when security analysts said it could become a bigger threat  – but never did anything significant. The report also said that phishing rose in May and June compared to the previous 10 months, driven by a campaign on social networking sites. (Information Week)