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(This blog was originally published in November 2017. In February 2019, Micro Focus acquired Interset)Cyber researchers have long speculated that Russian hackers are using Ukraine as a testing ground for cyberattacks on other counties. In October, they continued their assault on Ukraine with a pair of attacks—one on Odessa’s airport, another on Kiev’s metro system—aimed at paralyzing critical infrastructure. Thieves used the BadRabbit ransomware to cripple operations.