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p. 68 Symantec Corporation Internet Security Threat Report <strong>2013</strong> :: Volume 18 ThREAT ACTIVITy TRENDS Commentary • In 2012, corresponding with their large Internet populations, the United States and China remained the top two sources overall for malicious activity: The overall average proportion of attacks originating from the United States in 2012 increased by 1.6 percentage points compared with 2011, while the same figure for China saw an increase by 1.8 percentage points compared with 2011. Malicious activity in the Netherlands also increased by 1.6 percentage points, resulting in the country being ranked in sixth position, compared with twentieth in 2011. • 29.2 percent of network attacks originated in China: China has the largest population of Internet users 1 in the Asia region, with its Internet population growing to 564 million in 2012. • 50.0 percent of phishing websites were hosted in the United States: In 2012, with approximately 275 million Internet users, the United States has the second largest population of Internet users in the world. • The United States was ranked in first position for the source of all activities except for spam zombies and network attacks, for which India was ranked in first position for spam zombies and China the latter. • 15.3 percent of bot activity originated in the United States: The United States was the main source of bot-infected computers, an increase of 2.8 percentage points compared with 2011. • 34.4 percent of Web-based attacks originated in the United States: Web-based attacks originating from the United States increased by 0.9 percentage points in 2012. • 17.1 percent of spam zombies were located in India, a decrease of 0.3 percentage points compared with 2011: The proportion of spam zombies located in the United States rose by 2.4 percentage points to 4.2 percent, resulting in the United States being ranked in fifth position in 2012, compared with fifteenth position in 2011. • 17.2 percent of all malicious code activities originated from the United States, an increase of 3.9 percentage points compared with 2011, overtaking India as the main source of malicious code activity in 2012: With 16.2 percent of malicious activity originating in India, the country was ranked in second position. India has approximately 150 million Internet users, which is the third largest population of Internet users in the world.
p. 69 Symantec Corporation Internet Security Threat Report <strong>2013</strong> :: Volume 18 ThREAT ACTIVITy TRENDS Malicious Web-based Attack Prevalence Background The circumstances and implications of Web-based attacks vary widely. They may target specific businesses or organizations, or they may be widespread attacks of opportunity that exploit current events, zero-day vulnerabilities, or recently patched and publicized vulnerabilities that many users have yet to protect themselves against. While major attacks may have individual importance and often receive significant attention when they occur, examining overall Web-based attacks provides insight into the threat landscape and how attack patterns may be shifting. Analysis of the underlying trend can provide insight into potential shifts in Web-based attack usage and can assist in determining if attackers are more or less likely to employ Web-based attacks in the future. To see which vulnerabilities are being exploited by Web-based attacks, see Appendix D: Vulnerability Trends. Data Figure A.8. Malicious Website Activity, 2011–2012 Source: Symantec THOUSANDS 400 350 300 250 200 150 100 50 0 JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN Methodology This metric assesses changes to the prevalence of Web-based attack activity by comparing the overall volume of activity and the average number of attacks per day in each month during the current and previous reporting periods. JUL AUG SEP OCT NOV DEC 2011 2012
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