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New HollowGraph malware uses Microsoft Graph for stealthy C2 comms

BleepingComputer Jul 20, 2026 · 5:43 PM 👁 0 views ❤ 0 likes

A malicious component dubbed HollowGraph uses the calendar feature in compromised Microsoft 365 mailboxes as a command-and-control channel to receive attacker commands and exfiltrate stolen data. [...]

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