September 2026 | Microsoft Security Blog

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September 25 9 min read

Storm-3168: Agentic-driven cloud attacks using compromised service principals

Microsoft details JADEPUFFER-linked Azure reconnaissance, resource deletion, and credential access using compromised service principals, identifying the activity as associated with Storm-3168 and providing guidance for defenders.
September 24 12 min read

Beyond the ransomware: Tracking Storm-2570’s consistent tradecraft across deployments

Storm-2570 is a ransomware affiliate that uses consistent post-compromise tools and techniques across deployments involving Qilin, DragonForce, Anubis, and BERT ransomware, and provides guidance to help defenders detect and disrupt this activity before ransomware deployment.
September 24 3 min read

What’s new in Microsoft Security: September 2026

This month’s updates help you discover and control local AI agents, extend Zero Trust to agent traffic, and strengthen SOC foundations.
September 23 3 min read

Reimagining the SOC for the agentic era in Microsoft Defender

We are announcing ISOC in Microsoft Defender: a foundation built for agentic security that brings leading solutions for SIEM and threat protection together.
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September 22 15 min read

Unmasking EvilTokens: Getting to the root of device code phishing

EvilTokens has quickly become one of the top PhaaS platforms, enabling device code phishing attacks through AI-assisted lures, automated infrastructure, and token theft.
September 17 4 min read

From guidance to action: Security fundamentals that materially reduce risk

AI has made fundamental changes to the operating environment for cybersecurity.
September 17 3 min read

Improving email security outcomes with real-world Microsoft Defender insights

The latest email security benchmarking reports show strong Microsoft Defender performance across pre-delivery and post-delivery scenarios and reveal where threats and defenses continue to evolve.
September 10 9 min read

Protecting organizations from AI-assisted executive impersonation and invoice fraud

Microsoft examines an AI-assisted business email compromise campaign that used executive impersonation and fake invoices to target finance teams with ACH payment fraud.
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September 10 5 min read

Detect and disrupt AI-themed attacks with Microsoft Defender

See how Microsoft Defender detects and disrupts AI-themed phishing, malware, and multi-stage attacks across the attack chain.
September 9 15 min read

Threat matrix: Mapping threats across cloud web applications

Microsoft introduces the Cloud Web Applications Threat Matrix, a MITRE ATT&CK-aligned framework that helps defenders understand, prioritize, and mitigate threats to cloud-hosted web apps and serverless platforms.
September 9 19 min read

Passkey-themed social engineering leads to identity and cloud compromise

Passkey-themed social engineering is being used to compromise identities and enable broader cloud attacks.
September 4 6 min read

How to secure edge AI in customer-owned environments

As AI moves into customer-owned environments, organizations need new ways to verify the systems, software, and AI assets they trust before releasing sensitive data, credentials, and models.

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