On July 20, 2026, Group-IB security researchers released a study describing an implant known as HollowGraph that converts a hacked Microsoft 365 calendar into hidden communication channel. The virus ...
A recently discovered piece of malware abuses the Microsoft 365 calendar for command-and-control (C&C) communication, Group-IB reports. Dubbed HollowGraph, the malware is believed to be part of a ...
A newly discovered espionage implant has been using a hijacked Microsoft 365 calendar as its command channel, planting operator instructions and smuggling out stolen files as attachments on calendar ...
A newly identified Windows malware sample abuses Microsoft Graph API to transform a compromised Microsoft 365 calendar into a covert two-way command and control (C2) channel. Researchers at Group-IB ...
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