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Distributed Denial of Service (DDoS) attacks are getting bigger each quarter, new research showed.

The average peak size of DDoS attacks in Q2 this year increased by 216 percent compared to Q1, said researchers at VeriSign.

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In addition, there has been a year-on-year increase of 291 percent in average peak attack size, with 65 percent of the cyberattacks monitored by VeriSign exceeding 1 Gbps.

Between April 1 and June 30, attacks in the 5-10 Gbps range increased by 33 percent, while ones greater than 10 Gbps increased by 16 percent compared to the first three months of 2014, the report said.

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There have been reports of a decrease in the number of Network Time Protocol (NTP) servers that could end up used for DDoS attacks, and a slight drop in NTP amplification attack traffic. VeriSign said the primary attack vector for UDP floods continues to be large NTP floods.

“VeriSign observed increasing complexity in second-quarter DDoS attacks, including attacks that quickly and unpredictably changed vectors over the course of the mitigation,” the report said. “VeriSign saw sophisticated TCP and UDP floods that targeted specific customer application ports and continuously switched vectors.”

Click here to view the Trends Report.

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