Hackers stole more than 2 billion rubles (A$42 million) from correspondent accounts at the Russian central bank, the latest example of an escalation of cyber attacks on financial institutions around the globe.
Central bank official Artyom Sychyov said the hackers had attempted to steal about 5 billion rubles.
Sychyov was commenting on a central bank report released earlier in the day, that told about hackers breaking into accounts by faking a client's credentials. The bank provided few other details in its lengthy report.
Financial regulators around the world have recently urged banks to beef up cyber security in the wake of a string of high-profile heists on banks around the world.
Fears about attacks on banks have mounted since February when unknown cyber criminals stole US$81 million in funds that Bangladesh's central bank had on deposit at the New York Fed.
Law enforcement agencies around the globe are hunting for the criminals who stole the money using fraudulent wire-transfer requests sent over the SWIFT bank messaging network.
Russia separately said on Friday that it had uncovered a plot by foreign spy agencies to sow chaos in the country's banking system via a coordinated wave of cyber attacks and fake social media reports about banks going bust.