The suspect, the son of an IT engineer, was picked up this week in Buenos Aires, police said.
The BBC said police took the precaution of cutting power to the entire neighborhood before moving in so the suspect could not delete incriminating data before being placed in custody.
The so-called "super hacker" was accused of being the head of a six-member gang in that used the virus to intercept online money transfers between the sites and their customers. At the same time, an army of so-called "zombie" computers prevented the victims from accessing their accounts while they were being cleaned out, Britain's Sky News said.
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