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HOLLOWGRAPH which abuses the Microsoft Graph API and Microsoft 365 calendars to create hidden command and control channels via encrypted cloud communications.

HOLLOWGRAPH which abuses the Microsoft Graph API and Microsoft 365 calendars to create hidden command and control channels via encrypted cloud communications.

Cybersecurity

HOLLOWGRAPH turns Microsoft 365 calendars into hidden command and control channels

July 20, 2026

Integrity360 DFIR 2025: Recognized in Gartner's Market Guide

Integrity360 DFIR 2025: Recognized in Gartner's Market Guide

Integrity360 DFIR 2025: Recognized in Gartner's Market Guide

September 1, 2025