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scheduleUpdated 2026-10-28 · 04:17 UTC
articleTotal: 1890 reports
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HollowGraph malware abuses Microsoft 365 calendar for C2 and exfiltration
Microsoft 365 environments with compromised mailboxes. Threat actors leverage Microsoft Graph API and calendar features to establish covert command-and-control channels.
Microsoft20 Jul · 15:43 UTC
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HollowGraph Malware Uses Microsoft 365 Calendars for Covert C2
HollowGraph is a newly discovered espionage implant that leverages Microsoft 365 calendar infrastructure for command and control operations. The malware was identified and analyzed by Group-IB.
Microsoft20 Jul · 12:33 UTC