HollowGraph: Malware Uses Microsoft Graph for Hidden C2 Communication20. July 2026CybersecurityHollowGraph uses Microsoft Graph API via the calendar feature for command-and-control communication and data exfiltration within legitimate Microsoft 365 accounts. Share on:
HollowGraph Malware Uses Microsoft 365 Calendar as Command Channel20. July 2026CybersecurityHollowGraph conceals espionage commands in Microsoft 365 calendars and leverages the legitimate Graph API to evade detection systems. Share on:
