Hackers Spied on a Stock Exchange Executive's Outlook Mailbox for Five Months
Jun 04, 2026
Cyber Espionage / Malware
Unknown attackers spent at least five months inside the Outlook mailbox of a senior executive at a major global stock exchange, copying the inbox out in small, repeated batches and routing it through Dropbox and OneDrive so the traffic blended into normal cloud activity. Symantec and Carbon Black's Threat Hunter Team reported the campaign this week. This points to espionage, not a money grab: Symantec said the commands indicate intelligence collection, not theft for profit. Neither the executive nor the exchange was named. The value is plain enough: an exchange executive's inbox can hold non-public listing details, enforcement matters, deal terms, market-moving plans, plus the executive's calendar and contacts. Five months of quiet access handed the attacker a detailed read on the executive's dealings and where the organization was heading, without needing broad access to other business systems. The first malicious activity showed up on October 10, 2025. By th...
