The group - known as both "FIN7" and "the Carbanak Group" - stole more than 15 million customer card records from businesses in the US, UK, Australia and France.
FIN7 is considered to be a sophisticated professional hacking group that also targeted financial organisations in Russia, according to research by cyber security firm Kaspersky Lab.
There are reports that one bank lost more than $7m when FIN7 hackers forced its ATMs to dispense cash at pre-planned times when henchmen would collect it. Sealte Federal court has accused three Ukrainian citizens on 26 counts involving fraud and cyber attacks .
