(Bloomberg) -- Hackers used malware to penetrate the defenses of a Russian regional bank and move the ruble-dollar rate more than 15 percent in minutes, according to a Moscow- based cyber-security firm hired to investigate the attack.

Russian-language hackers deployed a virus known as the Corkow Trojan to infect Kazan-based Energobank and place more than $500 million in orders at non-market rates in February 2015, Group-IB told Bloomberg, without identifying individuals behind the attack. The resulting rate swing prompted a Russian central bank investigation into potential market manipulation.

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