A handful groups were responsible for most of the cyberattacks in 2013

A year-long study by CrowdStrike has identified more than 50 groups of cyber threat actors, blaming groups in China, Iran, Russia, North Korea, and Syria for high profile attacks. CrowdStrike reckons that the groups it is tracking make up the majority of the sophisticated threats attacking enterprises across the globe. Groups can be distinguished by the differences in their tactics, techniques, and procedures, such as the tools and infrastructure they use for attacks, their level of sophistication and the working hours hackers put in to running attacks.