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New HollowGraph malware uses Microsoft Graph for stealthy C2 comms
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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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
