LinkedIn·3 min read·hard
New Malware Turns Microsoft 365 Calendars Into Covert Command-and-Control Channel
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The Cyber Security Hub™
✦AI Summary
Security researchers have identified a new malware strain called HOLLOWGRAPH that uses Microsoft 365 calendar events as a covert command-and-control channel. The malware allows attackers to exfiltrate data and receive instructions by hiding malicious activity within legitimate cloud traffic.
A newly uncovered Windows malware implant is abusing Microsoft 365 calendar events to receive instructions and exfiltrate stolen files, allowing its operators to conceal espionage activity inside legitimate Microsoft cloud traffic.
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