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Hackers Are Turning Microsoft 365 Calendar Invites Into Secret Malware Command Channels

A stealthy new malware strain called HOLLOWGRAPH that hijacks Microsoft 365 calendars to secretly communicate with hackers, disguising malicious commands as ordinary calendar invites. HOLLOWGRAPH is a .NET-compiled malware component that abuses the Microsoft Graph API through a compromised Microsoft 365 account, turning the mailbox’s calendar into a covert two-way “dead drop” for hackers. The […] The post Hackers Are Turning Microsoft 365 Calendar Invites Into Secret Malware Command Channels appeared first on Cyber Security News.
A stealthy new malware strain called HOLLOWGRAPH that hijacks Microsoft 365 calendars to secretly communicate with hackers, disguising malicious commands as ordinary calendar invites. HOLLOWGRAPH is a .NET-compiled malware component that abuses the Microsoft Graph API through a compromised Microsoft 365 account, turning the mailbox’s calendar into a covert two-way “dead drop”…
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