The person suspected of being behind malware attacks known as "Carbanak" and "Cobalt" was arrested in Alicante, a port city on the south east coast of Spain.
One of Eastern Europe's most prolific cyber criminals has been arrested in a joint operation involving Belarus, Germany and the United States that aimed to dismantle a vast computer network used to carry out financial scams, officials said on Tuesday.
Spain's government warned on Friday that a large number of companies had been attacked by cyber criminals who infected computers with malicious software known as "ransomware” that locks up computers and demands ransoms to restore access.
Attempts at cyber wire fraud globally, via emails purporting to be from trusted business associates, have surged in the last seven months of 2016, the US Federal Bureau of Investigation said.
Bangladesh's central bank confirmed that cyber criminals tried to withdraw $951mn from its US bank account, as the country's finance minister said he first got to know of one of the biggest bank heists in history through the media.