---
id: 5993
title: "Hafnium Attack Timeline"
source_domain: semperis.com
source_url: "https://www.semperis.com/blog/timeline-of-hafnium-attack/"
published_at: "2021-05-05T15:13:49Z"
tags: ["zero-day", "active-directory", "web-shell", "exchange-server", "hafnium", "timeline"]
phying_url: "https://phying.com/item/5993"
lang: en
---

# Hafnium Attack Timeline

## Summary

Timeline and guidance on the Hafnium Exchange attacks affecting 21,000+ organizations: how four zero-days were exploited since January, how attackers plant web shells to reach Active Directory, and how to check for compromise.

## Intelligence Metadata

- **Sources:** semperis.com
- **Published:** 2021-05-05T15:13:49Z
- **Original:** https://www.semperis.com/blog/timeline-of-hafnium-attack/
- **Phying News:** https://phying.com/item/5993