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Microsoft Defender helps prevent, detect, and respond to attacks across devices, identities, apps, email, data, workloads, and clouds. Explore threat intelligence, capabilities, and real-world guidance to help you get more out of Defender.

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September 30 20 min read

Unauthenticated command injection on internet-facing mail servers: tracking CVE-2026-73570

Microsoft Threat Intelligence examines CVE-2026-73570 exploitation in Zimbra, including observed attack paths, detection opportunities, and mitigation guidance.
September 29 14 min read

Phishing Abuses RMM Tools for Persistent Access

Microsoft observed phishing campaigns that abused MSP360 RMM to deploy ScreenConnect, creating redundant remote-access channels for follow-on activity
September 29 20 min read

Star Blizzard refines phishing and malware delivery with the RedFlick technique

Since January 2026, Microsoft has observed Russian state threat actor Star Blizzard evolve their detection evasion capabilities through large-scale phishing campaigns, the use of accounts on compromised websites, and a novel malware delivery technique, tracked by Microsoft as “RedFlick”.
September 28 14 min read

NeedyMantis: Unpacking a post-compromise malware family used in targeted operations

Microsoft Threat Intelligence identified NeedyMantis, a modular post-compromise malware framework used in targeted intrusions that combines custom loaders, encrypted archives, and extensible components to maintain long-term access and support follow-on operations.
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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 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.
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.

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