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Your Calendar Is Now a Command Channel: What HOLLOWGRAPH Means for Microsoft 365 Security

by TechIT Services, LLC | Aug 17, 2026 | Cyber Security, Threat Intelligence

Most people picture malware “phoning home” to a shady server in a country you can’t find on a map. Your firewall blocks the IP, your DNS filter kills the domain, and the threat is contained. That mental model is why the HOLLOWGRAPH campaign is worth...

Your Calendar Is Now a Command Channel: What HOLLOWGRAPH Means for Microsoft 365 Security

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