New HollowGraph Malware Hijacks Microsoft 365 Calendars for Covert C2 Communications

V Vikas Thakur Published Jul 20, 2026 · 18:00 · 1 min read Infosecurity Magazine

Researchers have linked HollowGraph malware to the Cavern framework after discovering its use of Microsoft 365 calendars and Microsoft Graph APIs as a stealthy C2 channel

Source: Infosecurity Magazine

Vikas Thakur — Vikas covers DDoS attacks, botnet infrastructure, and network-layer threats. Hands-on experience with mitigation and traffic analysis, covers IoT botnets and infra-level attacks.

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New HollowGraph Malware Hijacks Microsoft 365 Calendars for Covert C2 Communications

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