# HollowGraph Malware Hides Command Server & Stolen Data in Microsoft 365 Events

Cybersecurity researchers discovered the HollowGraph malware, which conceals its command-and-control server and stolen files within Microsoft 365 events timestamped in the year 2050. This novel evasion technique exploits future-dated calendar entries to bypass detection. The discovery highlights the evolving sophistication of threats targeting cloud services.

**Importance:** 3/5

## Sources

### Security
- [The Hacker News](https://thehackernews.com/2026/07/hollowgraph-malware-hides-c2-and-stolen.html) — Mon, 20 Jul 2026 20:03:43 +0530