HOLLOWGRAPH malware turns Microsoft 365 calendars into an espionage channel

Microsoft 365 calendars have become a hiding place for espionage malware, with commands and stolen files stashed inside appointments dated to the year 2050, researchers from Group-IB discovered. Targeted campaign tied to Iranian espionage activity The malware, which Group-IB calls HOLLOWGRAPH, is one component of a bigger toolkit the company links with high confidence to the Cavern backdoor framework, a modular espionage toolkit built from separate plugins that each handle a different task, previously tied … More →

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