Hollowgraph Backdoor Turns Microsoft 365 Calendars into a C2 Channel Posted by benrothke on Tuesday August 04, 2026 @07:21AM from the picussecurity.com dept. https://www.picussecurity.com/resource/blog/hollowgraph-backdoor-turns-microsoft-365-calendars-into-a-c2-channel ( no comments | 2 points | on HN )
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