The Symantec Internet Security Threat Report provides a six-month update of worldwide internet threat activity. It includes analysis of network-based attacks, a review of known vulnerabilities, and highlights of malicious code. It also assesses trends in phishing and spam activity. This summary of the Internet Security Threat Report will alert readers to current trends and impending threats that Symantec has observed for the six-month period from July 1 to December 31, 2007.