Five Radware customers received extortion letters in December and January, threatening a DDoS attack if they did not pay five bitcoin (worth about $200,000) from a group posing as Fancy Bear, Lazarus Group and the Armada Collective.

The threat group first attacked late last summer and in the fall and all the published reports and research points to the group being responsible for well-publicized attacks on the New Zealand Exchange, OTP Bank and Magyar Telecom, among many others. At the time, the FBI issued a warning about a wave of DDoS attacks.

Pascal Geenens, director of threat intelligence at Radware, reported four of the five Radware customers targeted experienced DDoS attacks, with the longest and most powerful one running just under 10 hours at 237 gigabits-per-second and the shortest one lasting just a couple of hours. None of the Radware organizations affected sustained any downtime or suffered network issues because they rerouted their traffic to a Radware scrubbing center, Geenens said.  

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