Employees read a ransomware demand for the payment of $300 worth of bitcoin on company computers infected by the Petya software virus inside a retail store in Kiev, Ukraine, on June 28. (Vincent Mundy/Bloomberg News)
The cyber attack that crippled computer systems in Ukraine and other countries this week employed a ruse — the appearance of being ransomware — that seems designed to deflect attention from the attacker’s true identity, security researchers said.
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