# Microsoft 365 Takvimleri Casusluk İçin Kullanıldı

- **Source:** [The Hacker News](https://brifing.si/source/f944ec2b-8180-47bc-94de-57085b5a6563)
- **Published:** 2026-07-20
- **Original article:** <https://thehackernews.com/2026/07/hollowgraph-malware-hides-c2-and-stolen.html>
- **On Brifing:** https://brifing.si/s/c1bd599c-72f8-44fd-852d-bfd309a9497b



## Sources covering this story

- [www.theregister.com - Articles (theregister.co.uk) — Microsoft 365 Takvimleri Casusluk İçin Kullanıldı](https://www.theregister.com/security/2026/07/20/microsoft-365-calendars-become-spy-drop-boxes-in-hollowgraph-campaign/5274982)
- [www.theregister.com - Articles — Microsoft 365 takvimleri casusluk için kullanılıyor](https://www.theregister.com/security/2026/07/20/microsoft-365-calendars-become-spy-drop-boxes-in-hollowgraph-campaign/5274982)
- [The Hacker News — HollowGraph Casus Yazılımı Microsoft 365 Etkinliklerinde Veri Kaçırıyor](https://thehackernews.com/2026/07/hollowgraph-malware-hides-c2-and-stolen.html)

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_Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._