The growing market in systems running 64-bit operating systems is also leading hackers to develop 64-bit malware, according to a new report.
In a blog post, Guy Propper, cyber intelligence researcher at Deep Instinct, said that over the past two years many well-known malware families, including ransomware, banking malware and APT campaigns, began using 64-bit variants in addition to 32-bit variants – of which Zeus and Shamoon are just two examples.

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Source: SC Magazine