# Cavern backdoor framework

> As of 2026-07-29, Cavern backdoor framework is a Iran-nexus threat actor tracked by Threadlinqs Intelligence across 1 threat spanning malware.

- **Nation:** Iran
- **Tracked threats:** 1
- **Categories:** MALWARE
- **As of:** 2026-07-29

## Tracked threats

- [HollowGraph Malware Abuses Microsoft 365 Calendars for Covert C2 via Graph API](https://intel.threadlinqs.com/threat/TL-2026-1555) — HIGH

## Full data

Infrastructure, IOC values and detection queries (Splunk SPL / Microsoft KQL / Sigma) require the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp

Canonical: https://intel.threadlinqs.com/actor/Cavern%20backdoor%20framework