DDOS attacks have increased in number and size this year, report says

"Prolexic has seen a steady pattern of country-sourced botnet traffic across many quarters," the company said. "Iran, though, has not been included in the top 10 source countries before. It is expected that countries with the largest network infrastructures would have more incidents of botnet infection, so the appearance of Iran at number four definitely stands out."

This is the second quarter in a row when Russia, which historically has been an active region for DDOS attacks, did not make it into the top 10 DDOS source countries. However, there was an increase of DDOS traffic originating from Brazil, which validates the steady increase of botnet activity in South America, Prolexic said.