Catégorie : Microsoft Defender for Cloud

New Alert in Azure Defender for Azure Storage Account


We’d like to inform you that a new alert has been detected in Azure Defender for Azure Storage Account: A malicious blob has been downloaded from a storage account.

Alert (alert type)DescriptionMITRE tacticsSeverity
Malicious blob was downloaded from a storage account (Preview)
The alert indicates that a malicious blob was downloaded from a storage account. Potential causes may include malware that was uploaded to the storage account and not removed or quarantined, thereby enabling a threat actor to download it, or an unintentional download of the malware by legitimate users or applications.
Applies to: Azure Blob (Standard general-purpose v2, Azure Data Lake Storage Gen2 or premium block blobs) storage accounts with the new Defender for Storage plan with the Malware Scanning feature enabled.
Lateral MovementHigh, if Eicar – low

You can see a list of all of the alerts for for Azure Storage Account.


ACR | Containers vulnerability assessment powered by Microsoft Defender Vulnerability Management (MDVM)


Enhanced by Microsoft Defender Vulnerability Management (MDVM), the Azure Vulnerability Assessment is an effortless, plug-and-play solution, empowering security teams to swiftly identify and rectify vulnerabilities within Linux container images. This process requires no initial configuration for onboarding and eliminates the need for agent deployment.

Notably, this feature exclusively supports the scanning of images within the Azure Container Registry (ACR). Images stored in alternative container registries must be imported into ACR for coverage.

MDVM-powered Container Vulnerability Assessment boasts the following key capabilities:

  • Scanning OS Packages: This feature allows for the scanning of vulnerabilities present in packages installed by the OS package manager in Linux. Refer to the comprehensive list of supported OS and their versions for further details.
  • Language-Specific Packages: Support is extended to language-specific packages and associated files, along with their dependencies, whether installed or copied without the involvement of the OS package manager. For a complete list of supported languages, please consult our resources.
  • Image Scanning in Azure Private Link: This capability enables the scanning of images within container registries accessible through Azure Private Links. It is contingent upon access to trusted services and authentication with the registry. Learn how to enable access through trusted services.
  • Exploitability Insights: Each vulnerability report undergoes scrutiny within exploitability databases, assisting customers in gauging the actual risk associated with each reported vulnerability.
  • Comprehensive Reporting: Container Vulnerability Assessment for Azure, powered by Microsoft Defender Vulnerability Management (MDVM), furnishes vulnerability reports with the following recommendations:
    • Querying Vulnerability Information via Azure Resource Graph: This functionality facilitates the querying of vulnerability information through the Azure Resource Graph. Find out how to query recommendations via ARG.
    • Querying Vulnerability Information via Subassessment API: Obtain scan results through the REST API.
    • Support for Exemptions: Learn to create exemption rules for a management group, resource group, or subscription.
    • Support for Disabling Vulnerabilities: Gain insights into disabling vulnerabilities on images.

One-Time Triggering:

  • Each image pushed or imported to a container registry undergoes scanning immediately after the operation. Typically, the scan concludes within minutes, but may occasionally extend up to an hour.
  • [Preview] Images pulled from a registry are scheduled for scanning within 24 hours.

Microsoft Defender Vulnerability Management (MDVM) now incorporates an additional trigger for scanning images retrieved from an ACR. This enhancement extends coverage to active images, complementing existing triggers for scanning images pushed to an ACR within the last 90 days and images currently operational in AKS.

Continuous Rescan Triggering:

A continuous rescan is vital to ensure that images, previously scanned for vulnerabilities, receive updates to their vulnerability reports in the event of a newly discovered vulnerability.

  • A rescan is executed once daily for:
    • Images pushed within the last 90 days.
    • [Preview] Images pulled within the last 30 days.
    • Images currently active on the Kubernetes clusters monitored by Defender for Cloud, either via agentless discovery and visibility for Kubernetes or the Defender agent.


Private Endpoint support for Malware Scanning in Defender for Storage


I wanted to inform you that Private Endpoint support is now available as part of the Malware Scanning public preview in Defender for Storage. If you’re unfamiliar with the Malware Scanning feature in Defender for Storage, I highly recommend reading this informative blog post.

This exciting capability allows you to enable Malware Scanning on storage accounts that utilize private endpoints. By leveraging private endpoints, you can establish secure connectivity to your Azure Storage services, effectively eliminating any exposure to the public internet. This security measure aligns with the best practices for safeguarding your data.

If you already have Malware Scanning enabled on storage accounts with private endpoints, it’s important to note that you will need to disable and re-enable the plan with Malware Scanning for this new feature to work seamlessly.