Securing Enterprise AI Agents with Microsoft Sentinel
1. Introduction Enterprise adoption of Generative AI is accelerating rapidly through Microsoft 365 Copilot, Copilot Studio, Azure AI Foundry Agents, Security Copilot, and custom AI agents integrated with business applications. Unlike traditional SaaS applications, AI agents can: Access enterprise data Query internal knowledge repositories Invoke APIs and MCP tools Execute workflows Interact with business applications Make decisions on behalf of users While these capabilities improve productivity, they introduce a new attack surface that security teams must monitor and secure. Common AI threats include: Prompt Injection Cross Prompt Injection Attacks (XPIA) Jailbreak Attempts Unauthorized Tool Invocation Data Exfiltration through AI Agents Agent Identity Abuse Excessive Data Access Malicious MCP Tool Execution Traditional SOC monitoring platforms were designed for users, devices, applications and infrastructure—not autonomous AI systems. To address this challenge, Microsoft provides a comprehensive AI security monitoring framework built around: Agent 365 Observability Microsoft Agent Identities Microsoft Copilot Logs Defender XDR Defender for AI Microsoft Sentinel Together these components provide end-to-end observability of: User prompts Agent execution paths Tool invocations Safety signal detections Agent identities Security alerts 2. Reference Architecture AI Security Monitoring Architecture 3. Integration Architecture Microsoft provides multiple telemetry sources that complement one another. 3.1 Agent Runtime Telemetry Sentinel Data Connector Agent 365 Data Connector Table UnifiedAgentObservability Captures runtime behavior of AI agents including: User prompts Session IDs Conversation IDs Agent identities MCP tool invocations Connector invocations Tool arguments Tool responses Request payloads Response payloads Execution errors This dataset provides the forensic trail of everything an AI agent performed. 3.2 Agent Governance and Asset Inventory Sentinel Data Connector Microsoft Agent Identities Provides visibility into: Agent inventory Agent blueprint inventory Ownership Relationships Governance metadata Risk context This allows SOC teams to answer: Who owns this agent? What permissions does it have? Which business unit deployed it? Which related agents exist? 3.3 Copilot Audit and Usage Monitoring Sentinel Data Connector Microsoft Copilot Logs Connector Table CopilotActivity Provides: Copilot usage auditing Operational visibility User interaction tracking Useful for governance, compliance and adoption reporting. 3.4 AI Safety Telemetry Sentinel Data Connector Microsoft Defender XDR Connector Table CloudAppEvents CloudAppEvents provides AI safety signals such as: Prompt Shield detections Prompt Injection attempts Cross Prompt Injection Attacks (XPIA) Jailbreak-related verdicts Unsafe prompt classifications Think of CloudAppEvents as answering: "Was the prompt malicious?" 3.5 AI Security Alerts Sentinel Data Connectors Microsoft Defender XDR Microsoft Defender for Cloud Tables SecurityAlert SecurityIncident Used for: AI attack detections Security incidents Correlated investigation workflows 4. Understanding the Two Most Important AI Tables CloudAppEvents Focuses on AI Safety Questions answered: Was Prompt Shield triggered? Was this a jailbreak attempt? Was XPIA detected? Was the prompt suspicious? UnifiedAgentObservability Focuses on Agent Runtime Behavior Questions answered: What tool was invoked? Which connector executed? What arguments were passed? What data was returned? What actions did the agent perform? 5. Advanced Threat Hunting Scenarios The Agent365 Observability hunting guide contains several investigation scenarios that can be used directly in Microsoft Sentinel. Reference: Agent 365 Observability — AI Agent Telemetry Hunting https://github.com/SCStelz/security-investigator/blob/main/queries/cloud/agent365_observability.md 5.1 Prompt Injection Detection Detect prompts containing indicators such as: Ignore previous instructions Reveal system prompt Developer mode Disregard safety controls Investigation workflow: Review Tool Activity This allows analysts to determine whether a suspicious prompt resulted in downstream actions. 5.2 Session Reconstruction One of the most powerful capabilities of UnifiedAgentObservability is session reconstruction. Analysts can correlate: This creates complete forensic timelines. 5.3 MCP Tool Auditing Monitor all MCP activity including: query_lake Graph API tools ServiceNow connectors SharePoint connectors Custom enterprise tools Questions answered: Which tool was used? Who triggered it? What parameters were supplied? What data was returned? 5.4 Sensitive Data Access Monitoring Monitor AI agent interaction with: Employee records Customer data Financial information SharePoint repositories HR databases Useful for identifying: Data exfiltration attempts Excessive access patterns Sensitive data exposure 5.5 Query Lake Monitoring The GitHub hunting guide introduces monitoring of: query_lake RunAdvancedHuntingQuery Analysts can inspect: Actual KQL submitted Target workspaces Data sources queried Scope of access This provides visibility into AI-driven security investigations. 5.6 New Tool Detection Identify newly observed tool usage. Examples: Unauthorized MCP servers Newly registered connectors Unapproved tools Unexpected integrations This use case is particularly useful for governance programs. 5.7 Tool Failure Monitoring Monitor: Permission failures Connector failures Application errors Access-denied responses A sudden increase in failures may indicate: Reconnaissance activity Misconfiguration Privilege abuse attempts 6. Detection Engineering Opportunities Organizations can create Sentinel Analytics Rules for: 6.1 Prompt Injection Detection Developer Mode prompts Prompt Override attempts System Prompt disclosure requests 6.2 Jailbreak Attempt Detection Safety bypass attempts Role manipulation prompts Instruction override patterns 6.3 Unauthorized Tool Usage New MCP tools High-risk connectors Rare tool executions 6.4 Sensitive Data Access HR data queries Identity information retrieval Large-volume exports 6.5 Agent Identity Abuse Ownership changes Unexpected agent activity Agent-to-agent anomalies 7. Data Lake Exploration and Long-Term Analytics Because agent telemetry resides within Sentinel Data Lake, organizations can perform: Long-term AI investigations Historical AI attack analysis Agent baselining Governance reporting Trend analysis Tool inventory reporting Example dashboards include: Top Prompt Injection Attempts Most Active Agents High-Risk MCP Tools Agent Ownership Analysis AI Security Incidents Sensitive Data Access Trends 8. Summary AI agents represent the next major computing platform, but they also introduce a completely new attack surface. To effectively secure enterprise AI solutions, organizations require visibility across: User interactions Agent execution paths MCP tool usage Prompt safety signals Agent identities Security detections Microsoft Sentinel provides this unified view by integrating: Agent 365 Observability UnifiedAgentObservability Microsoft Agent Identities Microsoft Copilot Logs CloudAppEvents Defender XDR Defender for AI By combining AI runtime telemetry with AI safety signals and Defender detections, security teams can move beyond traditional monitoring and build a modern SOC capability for threat hunting, incident response, governance and forensic investigations across Microsoft 365 Copilot, Copilot Studio, Azure AI Foundry and future AI agent ecosystems. Reference: https://github.com/SCStelz/security-investigator/blob/main/queries/cloud/agent365_observability.mdUsing Microsoft Sentinel MCP Server with GitHub Copilot for AI-Powered Threat Hunting
Introduction This post walks through how to get started with the Microsoft Sentinel MCP Server and showcases a hands-on demo integrating with Visual Studio Code and GitHub Copilot. Using the MCP server, you can run natural language queries against Microsoft Sentinel’s security data lake, enabling faster investigations and simplified threat hunting using tools you already know. This blog includes a real-world prompt you can use in your own environment and highlights the power of AI-assisted security workflows. What is the Microsoft Sentinel MCP Server? The Model Context Protocol (MCP) allows AI models to access structured security data in a standard, context-aware way. The Sentinel MCP server connects to your Microsoft Sentinel data lake and enables tools like GitHub Copilot or Security Copilot to: Search security data using natural language Summarize findings and explain risks Build intelligent agents for security operations Prerequisites Make sure you have the following in place: Onboarded to Microsoft Sentinel Data Lake Assigned the Security Reader role Installed: Visual Studio Code GitHub Copilot extension (Optional) Security Copilot plugin if building agents Setting Up MCP Server in VS Code Step 1: Add the MCP Server In VS Code, press Ctrl + Shift + P Search for: MCP: Add Server Choose HTTP or Server-Sent Events Enter one of the following MCP endpoints: Use Case Endpoint Data Exploration https://sentinel.microsoft.com/mcp/data-exploration Agent Creation https://sentinel.microsoft.com/mcp/security-copilot-agent-creation Give the server a friendly name (e.g., Sentinel MCP Server) Choose whether to apply it to all workspaces or just the current one When prompted, Allow authentication using an account with Security Reader access Verify the Connection Open Chat: View > Chat or Ctrl + Alt + I Switch to Agent Mode Click the Configure Tools icon to ensure MCP tools are active Using GitHub Copilot + Sentinel MCP Once connected, you can use natural language prompts to pull insights from your Sentinel data lake without writing any KQL. Demo Prompt: 🔍 “Find the top three users that are at risk and explain why they are at risk.” This prompt is designed to: Identify the highest-risk users in your environment Explain the reasoning behind each user's risk status Help prioritize investigation and response efforts You can enter this prompt in either: VS Code Chat window (Agent Mode) Copilot inline prompt area Expected Behavior The MCP server will: Query multiple Microsoft Sentinel sources (Identity Protection, Defender for Identity, Sign-in logs) Correlate risk events (e.g., risky sign-ins, alerts, anomalies) Return a structured response with top users and risk explanation Sample Output from My Tenant Results Found: User 1: 233 risk score - 53 failed attempts from suspicious IPs User 2: 100% failure rate indicating service account compromise User 3: Admin account under targeted brute force attack This demo shows how the integration of Microsoft Sentinel MCP Server with GitHub Copilot and VS Code transforms complex security investigations into simple, conversational workflows. By leveraging natural language and AI-driven context, we can surface high-risk users, understand the underlying threats, and take action — all within a familiar development environment, and without writing a single line of KQL. More details here: What is Microsoft Sentinel’s support for MCP? (preview) - Microsoft Security | Microsoft Learn Get started with Microsoft Sentinel MCP server - Microsoft Security | Microsoft Learn Data exploration tool collection in Microsoft Sentinel MCP server - Microsoft Security | Microsoft Learn
Designing system to enable Adhoc queries
Hi, we are designing a data processing system in which the data goes through three different stages as shown below. What azure platforms or technologies do you recommend for a dynamic scenario like the one below where the input file format can change all the time, the transformations applied are not standard and the reports generated vary every time? Extract Data size can be around 1 GB. Can be of various formats and from various sources like FTP, API etc. Transform Transformations are applied on the data. Results After the transformations, results are exported to a final report table from which reports are generated.Gateway Timout on Azure Data Factory Copy Task
I'm trying to set up a copy job that connects to a text file in Data Lake Storage (v1) and copies the data to somewhere... I've set up the Active Directory application I've created a Data Factory (tried v1 and v2) I've created the copy task and connected to the Data Lake. I've successfully picked a file on the lake. The fie is a CSV file. On the file format settings screen I get a Gateway Timeout. Activity ID:2f860074-7a71-470d-87b9-b5523a13d8a6 when setting up the file. I've tried a simple file with 2 lines and 3 columns all the way to a zipped file with lots of columns I get a similar error on the v1 factory. Any ideas on what I've done wrong?Azure Data Lake Tools for VSCode supports Azure blob storage integration
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Azure Data Lake Analytics combines declarative and imperative concepts in the form of a new language called U-SQL. The idea of learning a new language is daunting. Don’t worry! U-SQL is easy to learn. You can learn the vast majority of the language in a single day. If you are familiar with SQL or languages like C# or Java, you will find that learning U-SQL is natural and that you will be productive incredibly fast. A common question we get is “How can I get started with U-SQL?” This blog will show you all the core steps you need to get ramped up on U-SQL. Read about it in the Azure blog.Control Azure Data Lake costs using Log Analytics to create service alerts
Azure Data Lake customers use the Data Lake Store and Data Lake Analytics to store and run complex analytics on massive amounts of data. However, it is challenging to manage costs, keep up-to-date with activity in the accounts, and proactively know when usage thresholds are nearing certain limits. Using Log Analytics and Azure Data Lake we can address these challenges and know when the costs are increasing or when certain activities take place. In this post, you will learn how to use Log Analytics with your Data Lake accounts to create alerts that can notify you of Data Lake activity events and when certain usage thresholds are reached. It is easy to get started! Read more about it in the Azure blog.Azure Data Lake launches in the West Europe region
Azure Data Lake Store and Azure Data Lake Analytics are now generally available in the West Europe region, in addition to the previously announced regions of East US 2, Central US, and North Europe. Azure Data Lake Store is a hyperscale enterprise data lake in the cloud that is secure, massively scalable, and built to the open HDFS standard. Read about it in the Azure blog.Azure Data Lake launches in the West Europe region
Azure Data Lake Store and Azure Data Lake Analytics are now generally available in the West Europe region, in addition to the previously announced regions of East US 2, Central US, and North Europe. Azure Data Lake Store is a hyperscale enterprise data lake in the cloud that is secure, massively scalable, and built to the open HDFS standard. Data from disparate data sources can be brought together into a single data lake so that all your analytics can run in one place. From first class integration with AAD to fine grained access control, built-in enterprise grade security makes managing security easy for even the largest organizations. With no limits to the size of data and the ability to run massively parallel analytics, you can now unlock value from all your analytics data at ultra-fast speeds. Read about it in the Azure blog.Microsoft Azure Data Lake Storage in Storage Explorer – public preview
Providing a rich GUI for Azure Data Lake Storage resources management has been a top customer ask for a long time, we are thrilled to announce the public preview for supporting Azure Data Lake Storage (ADLS) in the Azure Storage Explorer (ASE). With the release of ADLS resources in ASE, you can freely navigate ADLS resources, you can upload and download folders and files, you can copy and paste files across folders or ADLS accounts and you can easily perform CRUD operations for your folders and files. Azure Storage Explorer not only offers a traditional desktop explorer GUI for dragging, uploading, downloading, copying and moving your ADLS folders and files, but also provides a unified developer experiences of displaying file properties, viewing folder statistics and adding quick access. With this extension you are now able to browse ADLS resources along-side existing experiences for Azure Blobs, tables, files, queues and Cosmos DB in ASE. Read about it in the Azure blog.
