Tue, Aug 4 11:14 PM

Hollowgraph Backdoor Turns Microsoft 365 Calendars into a C2 Channel

Hacker News•Tue, Aug 4, 2026, 11:21 AM•2 min read

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Source: [Hacker News](https://www.picussecurity.com/resource/blog/hollowgraph-backdoor-turns-microsoft-365-calendars-into-a-c2-channel)

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