Such attacks can be hard to mitigate because of the negligible size of the DDoS traffic being routed through each one of the hundreds of IP addresses used in an attack, says Donny Chong, product director of enterprise security solutions at Nexusguard. In the first quarter of this year, such attacks became more automated and targeted, indicating that attackers have figured out how to launch them optimally, Nexusguard said in its report. The growing popularity of bit-and-pieces attack may have also contributed to DDoS attack sizes overall—both average and peak—decreasing last quarter, Chong says. The maximum DDoS attack size that Nexusguard observed in Q1 of 2019 was 145.4GBps—a nearly 55% drop year over year. The FBI's pre-Christmas 2018 crackdown succeeded in slashing the overall number of DDoS attacks globally by 11%, and average attack size by as much as 85% percent in Q4 last year. "The resurgence of DDoS-as-a-service and the growing botnets reinforce the evolving cyber threat of DDoS attacks for enterprises and communications service providers," Nexusguard said in the report Monday.