The suspects threatened to share the stolen data if the ransom was not paid. The attacks occurred in April this year.
Ukrainian police said that one 25-year-old hacker attacked nearly 100 companies in Europe and North America and caused $150 million in damage.
The operation was conducted jointly by the French National Gendarmerie (Gendarmerie Nationale), the Ukrainian National Police (Національна поліція України) and the United States Federal Bureau of Investigation (FBI), with the coordination of Europol and Interpol.
Ukrainian officers searched seven properties, seized $375,000 in cash, two luxury vehicles worth some $250,000 and froze $1.3 million in cryptocurrencies, Europol said.
Europol supported this joint action by providing “analytical, malware, forensic and crypto-tracing support.”
