Hackers probably gained access to Sony’s network last year after a series of phishing emails aimed at system engineers, network administrators and others who were asked to verify their Apple IDs, a security expert said today.

Last fall, Sony Pictures Entertainment, a U.S. subsidiary of Sony, was infiltrated by attackers, who purloined gigabytes worth of files, ranging from emails and financial reports to digital copies of recently-released films. Then just before Thanksgiving, the attackers crippled Sony’s PCs with malware that erased the machines’ hard drives.

Several weeks later, the FBI formally pinned responsibility for the attack on the North Korean government.

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