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HollowGraph Malware Uses Microsoft 365 Calendar Events as Dead-Drop C2 Channel
HollowGraph malware hides C2 commands and exfiltrated data inside encrypted Microsoft 365 calendar events dated 2050, using the Graph API to blend into legitimate cloud traffic.
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thehackernews.com
HollowGraph Malware Hides C2 and Stolen Files in Microsoft 365 Events Dated 2050
HollowGraph uses Microsoft 365 calendar events dated to 2050 to receive commands and exfiltrate encrypted files through legitimate Graph API traffic.
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theregister.com
Microsoft 365 calendars become spy drop boxes in HOLLOWGRAPH campaign
Malware hides commands in appointments set for 2050 and uses Redmond's own cloud to phone home
