Excellent analysis of developments during 2013

http://www.symantec.com/security_response/publications/threatreport.jsp

QUOTE: Highlights from 2013 Internet Security Threat Report, Volume 18

Key Findings

42% increase in targeted attacks in 2012.
31% of all targeted attacks aimed at businesses with less than 250 employees.
One waterhole attack infected 500 organizations in a single day.
14 zero-day vulnerabilities.
32% of all mobile threats steal information.
A single threat infected 600,000 Macs in 2012.
Spam volume continued to decrease, with 69% of all email being spam.
The number of phishing sites spoofing social networking sites increased 125%.
Web-based attacks increased 30%.
5,291 new vulnerabilities discovered in 2012, 415 of them on mobile operating systems