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New HollowGraph Malware Abuses Microsoft 365 Calendar for C&C Communication

·Source: SecurityWeek

Updated:

Executive Summary

Part of a larger toolkit, HollowGraph uses a compromised 365 account’s calendar as a two-way dead-drop. The post New HollowGraph Malware Abuses Microsoft 365 Calendar for C&C Communication appeared first on SecurityWeek .

Analysis

Part of a larger toolkit, HollowGraph uses a compromised 365 account’s calendar as a two-way dead-drop. The post New HollowGraph Malware Abuses Microsoft 365 Calendar for C&C Communication appeared first on SecurityWeek .
Source Attribution

Originally published by SecurityWeek on Jul 21, 2026.

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