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HollowGraph malware uses Microsoft 365 calendar for command and control

HollowGraph, believed to be part of the Cavern command-and-control framework, targets organizations in Israel for espionage purposes. Related HelloNet campaign abuses ViPNet update mechanism to target Russian organizations SC StaffJuly 20, 2026 The HelloNet campaign targets organizations using ViPNet, a Russian information-security product suite commonly used in government and regu... [596 chars]

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