OverviewList cybersecList Category cybersecAI Testing - Cybersecurity - HollowGraph Malware Hides C2 and Stolen Files in Microsoft 365 Events Dated 2050

HollowGraph Malware Hides C2 and Stolen Files in Microsoft 365 Events Dated 2050

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 events dated to the year 2050.

Group-IB, which named the malware HollowGraph, says the approach moves tasking and stolen data through legitimate Microsoft Graph API traffic, so the activity looks

3:10 pm, July 20, 2026

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https://thehackernews.com/2026/07/hollowgraph-malware-hides-c2-and-stolen.html

id: 2121
uid: Aal6m
insdate: 2026-07-20 15:10:05
title: HollowGraph Malware Hides C2 and Stolen Files in Microsoft 365 Events Dated 2050
additional: 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 events dated to the year 2050.

Group-IB, which named the malware HollowGraph, says the approach moves tasking and stolen data through legitimate Microsoft Graph API traffic, so the activity looks
category: Cybersecurity
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guid: https://thehackernews.com/2026/07/hollowgraph-malware-hides-c2-and-stolen.html
source_url: https://thehackernews.com/2026/07/hollowgraph-malware-hides-c2-and-stolen.html
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