Multiple Virtual Machines Mdvm Vulnerability Assessments

KQL detection rule by ep3p · MIT

Use here: https://portal.azure.com/#view/HubsExtension/ArgQueryBlade

// Use here: https://portal.azure.com/#view/HubsExtension/ArgQueryBlade
SecurityResources
| where type =~ "microsoft.security/assessments/subassessments" and id has "providers/Microsoft.Compute/virtualMachines"
| extend assessedResourceType = tostring(properties["additionalData"]["assessedResourceType"])
| where assessedResourceType == "ServerVulnerabilityTvm" // thus source == "Microsoft Defender vulnerability management"
| extend
    source = tostring(properties["additionalData"]["source"]), // scanner
    timeGenerated = todatetime(properties["timeGenerated"]),
    status = tostring(properties["status"]["code"]),
    category = tostring(properties["category"]),
    assessmentDisplayName = tostring(properties["displayName"]),
    assessmentDescription = tostring(properties["description"]),
    assessmentCvssv3 = tostring(properties["additionalData"]["cvssV30Score"]),
    assessmentSeverity = tostring(properties["status"]["severity"]),
    softwareVendor = tostring(properties["additionalData"]["softwareVendor"]),
    softwareName = tostring(properties["additionalData"]["softwareName"]),
    softwareVersion = tostring(properties["additionalData"]["softwareVersion"]),
    recommendedVendor = tostring(properties["additionalData"]["recommendedVendor"]),
    recommendedProgram = tostring(properties["additionalData"]["recommendedProgram"]),
    recommendedVersion = tostring(properties["additionalData"]["recommendedVersion"]),
    resourceId = tostring(properties["resourceDetails"]["id"]),
    assessmentId = tostring(properties["id"]),
    cve = properties["additionalData"]["cve"]
| mv-expand cve = iff(array_length(cve) == 0, dynamic([""]), cve)
| extend
    cve,
    description = tostring(cve["description"]),
    severity = tostring(cve["severity"]),
    cvss = tostring(cve["cvssScore"]),
    cvssVersion = toint(cve["cvssVersion"]),
    hasPublicExploit = toboolean(cve["hasPublicExploit"]),
    isExploitVerified = toboolean(cve["isExploitVerified"]),
    isExploitInKit = toboolean(cve["isExploitInKit"]),
    exploitabilityLevel = tostring(cve["exploitabilityLevel"]),
    exploitTypes = strcat_array(cve["exploitTypes"], ", "),
    isZeroDay = toboolean(cve["isZeroDay"])
| extend
    cve = tostring(cve["title"]),
    cvssv2 = iff(cvssVersion == 2, cvss, ""),
    cvssv3 = iff(cvssVersion == 3, cvss, ""),
    hasExploit = exploitabilityLevel != "NoExploit"
| sort by isExploitInKit desc, isExploitVerified desc, hasPublicExploit desc
| project timeGenerated, resourceId, tenantId, subscriptionId, location, resourceGroup, assessedResourceType, source, status, category, assessmentDisplayName, assessmentDescription, assessmentCvssv3, assessmentSeverity, softwareVendor, softwareName, softwareVersion, recommendedVendor, recommendedProgram, recommendedVersion, assessmentId, cve, description, severity, cvssv2, cvssv3, hasPublicExploit, isExploitVerified, isExploitInKit, exploitabilityLevel, exploitTypes, isZeroDay, hasExploit
| summarize
    Scanners = make_set(source),
    Vulnerabilities = make_list(pack(
        "CVE", cve,
        "Description", description,
        "Severity", severity,
        "CVSSv2", cvssv2,
        "CVSSv3", cvssv3,
        "HasExploit", hasExploit,
        // "HasPublicExploit", hasPublicExploit,
        // "IsExploitVerified", isExploitVerified,
        // "IsExploitInKit", isExploitInKit,
        // "ExploitTypes", exploitTypes,
        // "IsZeroDay", isZeroDay
        "AssessmentDisplayName", assessmentDisplayName,
        "AssessmentId", assessmentId
        )),
    HasExploitableVulnerability = binary_all_or(tolong(hasExploit)),
    arg_max(timeGenerated, subscriptionId, location, resourceGroup, assessedResourceType, assessmentDisplayName, assessmentDescription, assessmentSeverity, assessmentCvssv3)
    by category, status, tenantId, resourceId, assessmentId
| summarize
    Scanners = make_set(Scanners),
    Vulnerabilities = make_list(Vulnerabilities),
    AssessmentsDisplayNames = strcat_array(make_list(assessmentDisplayName), ", "),
    AssessmentsCVSSv3 = max(toreal(assessmentCvssv3)),
    HasExploitableVulnerability = binary_all_or(tolong(HasExploitableVulnerability)),
    arg_max(timeGenerated, subscriptionId, location, resourceGroup, assessedResourceType)
    by category, status, tenantId, resourceId
| join kind=leftouter (
    ResourceContainers
    | where type == "microsoft.resources/subscriptions"
    | project subscriptionId, subscriptionName = name
    ) on subscriptionId
| sort by tenantId asc, subscriptionName asc, status asc, resourceId asc
| project
    resourceId,
    tenantId,
    subscriptionId,
    subscriptionName,
    location,
    resourceGroup,
    assessedResourceType,
    Scanners,
    status,
    category,
    AssessmentsDisplayNames,
    AssessmentsCVSSv3,
    HasExploitableVulnerability,
    Vulnerabilities

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

be79aa75-da52-4598-80ee-d9e7818b153e

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

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Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

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[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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