HOLLOWGRAPH Malware Turns Microsoft 365 Calendars Into a Covert Spy Channel
Group-IB has uncovered HOLLOWGRAPH, a stealthy malware component that hides its command-and-control traffic inside Microsoft 365 calendar invites dated decades in the future. The tool shows technical overlap with an Iran-nexus backdoor framework and appears to be running a narrow espionage campaign against Israeli organizations.
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