The FBI and Microsoft have broken up a large network of hijacked home computers responsible for stealing over £323 million from the accounts of bank customers.
In order to illegally obtain data, the Citadel network had remotely installed a keylogging program on around five million machines.
The majority of networks which formed the Citadel botnet have now been shut down following the efforts of police forces, banking bodies and tech firms in 80 countries.
Richard Boscovich, a spokesperson for Microsoft's digital crimes unit, said: "The bad guys will feel the punch in the gut."
Cybercriminals used login and password details for online banking stolen from compromised computers.
HSBC, American Express and PayPal were among the targets.
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