HOLLOWGRAPH Malware Hides Command-and-Control in Microsoft 365 Calendars Malware HOLLOWGRAPH Malware Hides Command-and-Control in Microsoft 365 Calendars Do Son July 20, 2026 0 At a glance Malware family HOLLOWGRAPH, linked with high confidence to the Cavern backdoor framework Threat actor... Read More Read more about HOLLOWGRAPH Malware Hides Command-and-Control in Microsoft 365 Calendars
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