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Microsoft 365 calendars become spy drop boxes in HOLLOWGRAPH campaign

  • The Register faviconThe Register

    Jul 20, 2026, 10:59 am120 ptsTrending
    photo of Microsoft 365 calendars become spy drop boxes in HOLLOWGRAPH campaign imageMicrosoft 365 calendars have become the latest hiding place for espionage malware, with attackers stashing commands and stolen files inside appointments dated 24 years into the future. Researchers at Group-IB say they've uncovered a malware component they call HOLLOWGRAPH that swaps the usual…
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