Internet of Things (IoT) devices have been the primary force behind the biggest distributed denial of service (DDoS) botnet attacks for some time. It's a threat that has never really diminished, as numerous IoT device manufacturers continue to ship products that cannot be properly secured. A10 Networks, a leading application delivery controller manufacturer, has been keeping tabs on DDoS attacks around the globe for several years now. The company's quarterly State of DDoS Weapons Report provides a very useful snapshot of the current activity and threat level. The recently-published report for the fourth quarter of 2019 is noteworthy in identifying some new trends that are amplifying DDoS attacks, including a common vulnerability in the WD-Discovery protocol that is being widely exploited and the use of autonomous number systems (ANS) to track attacks back to their source.