Microsoft Security Blog
Your source for the latest in cybersecurity
Ambient and autonomous security for the agentic era
In the agentic era, security must be ambient and autonomous, like the AI it protects. This is our vision for security, where security becomes the core primitive.
Agents built into your workflow: Get Security Copilot with Microsoft 365 E5
At Microsoft Ignite 2025, we are not just announcing new features—we are redefining what’s possible, empowering security teams to shift from reactive responses to proactive strategies.
Threat intelligence
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SesameOp: Novel backdoor uses OpenAI Assistants API for command and control
Microsoft Incident Response – Detection and Response Team (DART) researchers uncovered a new backdoor that is notable for its novel use of the OpenAI Assistants Application Programming Interface (API) as a mechanism for command-and-control (C2) communications. -
Inside the attack chain: Threat activity targeting Azure Blob Storage
Azure Blob Storage is a high-value target for threat actors due to its critical role in storing and managing massive amounts of unstructured data at scale across diverse workloads and is increasingly targeted through sophisticated attack chains that exploit misconfigurations, exposed credentials, and evolving cloud tactics. -
Investigating targeted “payroll pirate” attacks affecting US universities
Microsoft Threat Intelligence has identified a financially motivated threat actor that we track as Storm-2657 compromising employee accounts to gain unauthorized access to employee profiles and divert salary payments to attacker-controlled accounts, attacks that have been dubbed “payroll pirate”.
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AI and machine learning
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Ambient and autonomous security for the agentic era
In the agentic era, security must be ambient and autonomous, like the AI it protects. This is our vision for security, where security becomes the core primitive. -
Agents built into your workflow: Get Security Copilot with Microsoft 365 E5
At Microsoft Ignite 2025, we are not just announcing new features—we are redefining what’s possible, empowering security teams to shift from reactive responses to proactive strategies. -
Securing our future: November 2025 progress report on Microsoft’s Secure Future Initiative
When we launched the Secure Future Initiative, our mission was clear: accelerate innovation, strengthen resilience, and lead the industry toward a safer digital future.
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Latest posts
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Agents built into your workflow: Get Security Copilot with Microsoft 365 E5
At Microsoft Ignite 2025, we are not just announcing new features—we are redefining what’s possible, empowering security teams to shift from reactive responses to proactive strategies. -
Ambient and autonomous security for the agentic era
In the agentic era, security must be ambient and autonomous, like the AI it protects. This is our vision for security, where security becomes the core primitive. -
Collaborative research by Microsoft and NVIDIA on real-time immunity
Read about Microsoft and NVIDIA joint research on real-time immunity. -
Securing our future: November 2025 progress report on Microsoft’s Secure Future Initiative
When we launched the Secure Future Initiative, our mission was clear: accelerate innovation, strengthen resilience, and lead the industry toward a safer digital future. -
Whisper Leak: A novel side-channel attack on remote language models
Microsoft has discovered a side-channel attack on language models which allows adversaries to conclude model conversation topics, despite being encrypted. -
New IDC research highlights a major cloud security shift
New IDC research shows why CISOs must move toward AI-powered, integrated platforms like CNAPP, XDR, and SIEM to reduce risk, cut complexity, and strengthen resilience.