AI Summary

Unknown attackers accessed a senior executive’s Outlook mailbox at a major global stock exchange for at least five months. They copied the inbox contents in small, repeated batches, then routed the data through Dropbox and OneDrive to blend the exfiltration with normal cloud traffic. Symantec and Carbon Black’s Threat Hunter Team identified the campaign this week. The report highlights the prolonged, covert nature of the data theft and the use of legitimate cloud services to conceal the activity.

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