Enterprise Office 365 accounts, many belonging to high-level employees at Fortune 2000 companies, were hit with a brute-force attack in one of the earliest operationalized cloud-to-cloud business attacks, according to Skyhigh Networks, which began tracking the campaign early this year. Skyhigh detected a pattern of organized attacks including more than 100,000 failed Office 365 logins from 67 IP addresses and 12 networks.

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