# Watch out - that Microsoft Calendar invite dated 2050 could be hiding stolen files and worse

> Group‑IB discovers HollowGraph malware targeting Israeli entities, exfiltrating files via Microsoft Graph APIOperators hide instructions in future calendar entries, then attach encrypted stolen data to eventsAt least 12…

- **Source:** [TechRadar](https://www.techradar.com/pro/security/watch-out-that-microsoft-calendar-invite-dated-2050-could-be-hiding-stolen-files-and-worse?utm_source=gearopen.com&utm_medium=referral&utm_campaign=feed&utm_content=6a5fb6264c3dea13d3b8876e)
- **Published:** 2026-07-21
- **Category:** Computers & IT
- **Tags:** #microsoft
- **Canonical:** http://localhost:4321/a/6a5fb6264c3dea13d3b8876e

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_GearOpen's distilled summary. The full original article is published at TechRadar (source link above); GearOpen does not republish the source's full text._