Hackers Built a Windows Backdoor Whose Entire C2 Lives Inside Microsoft 365

Hackers have built a Windows backdoor that uses Microsoft 365 for all its native command and control communications. Named Antino, the malware turns Outlook messages and OneDrive files into channels for issuing instructions, moving stolen data, and maintaining access to compromised computers. The wider campaign began in September 2025 and targeted government, defense, diplomatic, academic, […]

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