internet security tHreAt rePOrt GOVernMent 2013

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p. 124 Symantec Corporation Internet Security Threat Report <strong>2013</strong> :: Volume 18 SPAM AND FRAUD ACTIVITy TRENDS Significant Spam Tactics Background This section discusses significant spam tactics used throughout 2012, including the size of spam messages and the languages used in spam emails. Size of Spam Messages Figure c.8. Frequency of Spam Messages by Size, 2012 Source: Symantec 60% 50 40 30 20 10 49% 100 KB • In 2012, 49 percent of spam messages were less than 5 KB in size. For spammers, smaller file sizes mean more messages can be sent using the same resources. • Increased sizes are often associated with malicious activity, where email attachments contain malicious executable code.
p. 125 Symantec Corporation Internet Security Threat Report <strong>2013</strong> :: Volume 18 SPAM AND FRAUD ACTIVITy TRENDS Proportion of Spam Messages Containing URLs Figure c.9. Proportion of Spam Messages Containing URLs, 2012 Source: Symantec 100% 90 80 70 60 50 40 30 20 10 Top-level Domains (TLD) Identified in Spam URLs Figure c.10. Analysis of Top-level Domains Used in Spam URLs, 2012 Source: Symantec 70% 60 50 40 30 20 10 82 JAN 63% COM 77 FEB 78 MAR 8% RU 84 86 86 85 APR MAY 5% 7% 6% INFO JUN JUL NET 91 AUG 82 SEP ORG 96 OCT 88 NOV 3% BR 95 TREND DEC In 2012, 85.3 percent of spam messages contained at least one URL hyperlink, compared with 86.2 percent in 2011, a decrease of 0.9 percentage points.
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