Blue Coat Systems issued its Blue Coat 2012 Web Security Report that identifies and analyzes trends in malicious attacks over the past year and makes recommendations on strategies to keep companies safe. In 2011, the most significant evolution in the threat landscape was the use of malware networks, or malnets, to launch highly dynamic Web-based attacks. These complex infrastructures, which outlast any one attack, drove a 240% increase in the number of malicious sites during the year and are expected to launch as many as two-thirds of all new attacks in 2012.