How Often Are VMs Scanned in Azure CSPM?

Azure CSPM (Cloud Security Posture Management) helps users maintain secure cloud setups. This post covers the basics, including the role of scanning virtual machines, various scan methods, and methods for viewing results.

What Is Azure CSPM and How It Works

Azure CSPM is an acronym for Cloud Security Posture Management in Azure. It’s a feature of Microsoft Defender for Cloud that looks for security gaps in your cloud resources. The tool identifies misconfigurations, weaknesses, and threats throughout Azure setups. Users receive alerts and remediation steps, helping keep the environment safe.

• The service evaluates resource metadata and activity logs using Azure Resource Graph and Azure Policy signals, covering virtual machines, storage, and networks.
• It inspects setups by applying rules derived from recognized standards, such as CIS benchmarks or Azure policies.
• Any gaps or misconfigurations found are flagged as recommendations for action.
• For example, an unsecured virtual machine is flagged, and CSPM suggests corrective measures.

Find misconfigurations, risks on your cloud easily

Try Agentless Cloud Vulnerability Scanner

Learn More

Monitoring and Integration Features

1. Real-Time Monitoring and Secure Score

Azure CSPM monitors changes in real time. It monitors updates to resources to identify new risks as they emerge. This continual check serves as a guard against attacks before they occur. It surfaces the Microsoft Defender Secure Score (0‑100 %) for each subscription, providing a number that indicates how well protected the configuration is. Higher scores indicate fewer open issues.

2. Continuous Assessment and Azure Integration

CSPM evaluates configurations across compute, data, networking, identity, and other Azure services. It is fully integrated with the rest of the Azure toolkit. Users initiate the process by enabling Defender for Cloud on their subscriptions. Once it is in use, it begins to collect data with minimal manual effort. Assessments run continuously in near‑real time; no user‑scheduled scans are required, and results appear in the Azure portal.

3. Multi-Cloud Views and Automated Policies

Azure CSPM also offers multi-cloud views, but in Azure, it leverages native capabilities. It utilizes API calls to retrieve the information, making it highly efficient. In some cases, users can establish policies that require fixes to be carried out automatically.

Why Virtual Machine (VM) Scanning Matters in Azure

The virtual machine scanning in Azure helps identify security issues that, in specific scenarios, could lead to data leakage or compromise the system. VMs run critical workloads, and any weakness in VMs opens the door to attackers.

Key reasons VM scanning is essential include:

• Early detection of vulnerabilities allows for quick fixes.
• VMs connect to networks and handle sensitive information, increasing risk.
• Scanning identifies unpatched software and vulnerable open ports.
• It detects well-known vulnerabilities at both the operating system and application layers.

This proactive approach helps teams respond effectively to emerging threats.

Key Benefits for Security and Operations

1. Malware Protection and Incident Response

Defender provides malware protection for Servers (which complements CSPM findings). Malware can siphon off data or even shut down operations. Azure inspects code by scanning files and processes. This process is essential for adhering to rules such as the GDPR or industry standards, which require periodic checks to be made. 

Scanning supports incident response. If an attack occurs, historical scan data can help trace the entry point. It indicates what was modified in the VM before the problem manifested. This accelerates recovery and reinforces future configurations.

2. Cost Efficiency and Security Best Practices

Scans also keep costs in check. Patch fixes also prevent breaches from causing downtime, which can be costly and detrimental to operations. It ensures the smooth operation of resources without hindrance from security threats. Scan results guide developers toward better security practices. They learn not to start any weak/insecure config.

3. Adaptation to Cloud Dynamics

The way Azure scans is also a reflection of the cloud dynamics, where VMs can grow and shrink very fast. Humans can’t do it all fast enough, so you also need computerized checks. They continue running even without interrupting their work, affording full coverage.

In the absence of VM scanning, the VMs themselves serve as a compromise entry point for wider attacks. Cloud VMs are attractive targets because they are powerful and accessible. Scanning prevents this by making sure you follow the security standards.

4. Comprehensive Security Layering

CSPM also integrates with Azure’s threat protection, layering features such as endpoint detection on top of it. This combination creates comprehensive defenses. It also addresses hybrid environments, where on-premises and cloud resources are combined. Its broad reach is intended to cover everything.

5. Audit Compliance and Reporting

Lastly, periodic scanning satisfies audit requirements. It generates logs and reports that adhere to security due diligence. This assists with reviews and develops trust with stakeholders.

How Azure Scans VMs: Agent-Based, Agentless, and Antimalware Tools

Azure uses different methods to scan virtual machines for security issues. These include agent-based, agentless, and antimalware options. Each method suits specific needs and setups.

1. Agent-Based Approach

Agent-based scanning installs software on the VM. This agent retrieves information from within the machine. It examines files, processes, and configuration details. 

For instance, Microsoft Defender for Endpoint functions like an agent. It monitors behavior and raises alarms if anything appears suspicious. This is very insightful, but it necessitates setup on every VM. Users can deploy it through Azure policies or manually to activate it. Once running, it scans continuously. It identifies software weaknesses and then reports them to Defender for Cloud.

2. Agentless Approach

With agentless scanning, nothing is installed on the VM. It doesn’t collect data, but instead uses Azure’s cloud capabilities. It creates snapshots of VM disks and analyzes them offline. This prevents having to take performance hits on the VM.

Agentless scanning detects vulnerabilities, secrets, and software inventory. Azure performs agentless scans every 24 hours by default. You enable it in Defender for Cloud settings. Currently unsupported for VMs using customer‑managed keys.

Agentless vulnerability scans are conducted regularly, typically on a daily basis. In this modality, malware controls are performed, along with quick and full scans. If the scans are more than thirty days behind, Azure will report it as a recommendation.

3. Antimalware and Additional Options

Antimalware applications specialize in identifying malicious software. Microsoft Defender Antivirus works with both agent-based and agentless scans. In agentless mode, it uses disk snapshots to search for signs of a malware infection.

This can find threats without executing on the VM. For the Defender for Servers plans, users enable antimalware in Defender. It checks for known malware and automatically updates definitions. Together with vulnerability scans, it offers wide-ranging coverage.

4. Third-Party and Marketplace Scanning Tools

Azure also has tools such as Qualys or Trend Micro available for additional scanning. These may be either agent-based or deployed using a marketplace. But most needs are covered by native Azure tools. 

5. Scan Timing and Scheduling Differences

Scan timing varies by type. The agent-based model runs continuously, updating in real-time. Agentless scanning runs on a daily schedule. Agentless doesn’t allow users to alter the 24-hour cycle, but in some situations, they can initiate manual scans.

6. Choosing the Right Approach: Tradeoffs and Considerations

There are trade-offs between the methods, depending on the VM type. Agentless fits brief set up with minimal overhead. Agent-based protection works for modern threat hunting. Azure integrates these methods for defense-in-depth. Agentless handles broad security checks, while agents provide more granular controls. Antimalware adds a specific malware focus.

For a multi-cloud environment, Azure uses agentless scanning for AWS and GCP VMs. This unifies scanning across platforms. These approaches maintain VM security with minimal user intervention. They can handle varying workloads and security levels.

How to Check VM Scan Status and Results in Azure

1. Step-by-Step: Viewing Scan Status

1. Open the Azure portal and navigate to Microsoft Defender for Cloud.
2. Select Recommendations from the menu.
3. Look for entries related to VMs, such as “Machines should have vulnerability findings resolved.”
4. Select a recommendation to:
   • View the list of affected VMs.
   • See scan dates, findings, and severity levels.
   • Check malware flags to ensure scans are up to date.

Use Azure’s Assets (formerly Inventory) page in Defender for Cloud to get detailed scan results.

• Filter by VM to review vulnerabilities, secrets, or malware incidents.
• Export findings via built-in export options:
  • Download as CSV.
  • Send to Log Analytics for further querying.

3. Verifying Scan Status and Settings

Make sure that the required security features are enabled and validated across your environment.

• Navigate to Environment settings > Workload protections.
• Verify that Vulnerability Assessment and Malware Scanning are enabled.
• For bulk/complex queries, use Azure Resource Graph and write KQL queries to track scan status across multiple VMs.

4. Monitoring via Third-Party and Native Tools

Depending on the toolset, scan results may be available in different locations; however, Azure Defender provides integrated options.

• For third-party tools, consult their dashboards for combined scan results.
• Rely on Defender for Cloud for unified Azure-native reporting.
• Enable email alerts to stay informed about new vulnerabilities or overdue scans.

5. Getting Scan Summaries for Individual VMs

To check scans on a specific VM:

• Open the VM blade in the Azure portal.
• Select the Security section to view recent scan summaries.
• Note: Agentless scans appear on the day after they run—always check scan timestamps for freshness.

6. Issue Resolution and Status Updates

To address identified issues and keep your scan data current:

• Verify your subscription includes the correct Defender for Servers or CSPM plan.
• Use PowerShell or Azure CLI (e.g., Get-AzSecurityAssessment) to check scan statuses programmatically.
• Track remediation tasks and, once vulnerabilities are patched, trigger a rescan to confirm updates and maintain visibility into your VM’s security posture.

Final Thoughts

Azure CSPM provides a vital perspective on virtual machine scanning, offering agentless methods that run daily to detect anomalies and malware quickly. By increasing knowledge of what it is, why it is relevant, and how there are different ways to scan your cloud environment, people can better protect their cloud presence from emerging threats.

Solutions like Astra Security build on this by providing custom cloud pentesting services, such as manual testing and compliance assistance, to help address what may be missing from automated scans.

Applying these best practices will help you take a proactive approach towards security, thus minimizing security risks and supporting business continuity on Azure.

One scan. Total cloud visibility

Try Modern Cloud Vulnerability Scanner

Learn More

FAQs