Locky and Cerber attacks yielded about $7 million each as victims paid to regain access to their data.Victims of ransomware attacks have paid hackers more than $25 million to get back their data over the past two years, according to researchers from Google, Chainalysis, the University of California at San Diego and the NYU Tandon School of Engineering.The study was presented at a Wednesday security conference, The Verge reported.Researchers used blockchain to follow payments and compare data to create a layout of the ransomware environment. To gather this data, the team tracked 34 ransomware families.

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