Distributed database that is used to maintain a continuously growing list of records, called blocks.
Servers of one of the Italian banks in 2015 were used by hackers to mine crypto currency, Quartz reports.
According to the director of the UK-based Darktrace, specializing in cyber security, in January 2015, his specialists investigated the intervention in the system of financial organizations and identified data flows that were sent from the bank's servers to the botnet.
It was a fairly well known European criminal botnet. The data was not customer data; it turned out to be a fairly buggy implementation of bitcoin mining software. I don’t think they made very much money out of it.
Director of technology, Darktrace
The captured server was shut down less than an hour after the start of the crypto currency production.
Dave Palmer also added that the period of the heyday of criminal production of crypto currency fell on 2014-2015. For comparison, in the last six months of 2017, Darktrace identified only 24 similar cases.
Also, some time ago, hackers hijacked the Ethereum Classic Wallet and was able to steal around $300 000.