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The Monthly Threat Report by Hornetsecurity brings you monthly insights into M365 security trends, email-based threats, and commentary on current events in the cybersecurity space. This edition of the Monthly Threat Report focuses on data from the month of December 2025.

In this article, we will walk you through the most significant incidents between 2024 and 2025. More importantly, we will explain what these incidents reveal about gaps in today’s defenses and incident response plans.

Preparing and maintaining a well thought out ransomware response plan allows your organization to respond proactively to ransomware attacks. This preparation can significantly reduce the impact of a Ransomware incident and increase the chances of data recovery. We don’t want to end up with a brick to the face. 

In this article, we unpack how ransomware is changing, how AI is reshaping both offense and defense, and what our latest CSR 2026 data reveals about real-world security concerns.