Microsoft Sentinel high experimental kql

GTI - Initial Access Broker Alert Detected

Triggers an incident when a GTI Relevance System Alert of type initial_access_broker is ingested. Initial Access Broker alerts indicate that a threat actor is advertising or has sold access (credentials, VPN, RDP, admin panels, etc.) to an organisation that matches your profile. These are high-urgency signals that may indicate imminent compromise or an ongoing breach. Each unique Alert ID is grouped into a single incident.

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Detection Logic

GTIRelevanceSystemAlerts
| where DetailType == "initial_access_broker"
| project
    TimeGenerated,
    AlertId,
    AlertName                       = DisplayName,
    AlertState                      = State,
    BrokerSeverity                  = InitialAccessBrokerSeverity,
    DiscoveryDocuments              = InitialAccessBrokerDiscoveryDocumentIds,
    PriorityLevel,
    PriorityReasoning,
    SeverityLevel,
    SeverityConfidence,
    SeverityReasoning,
    RelevanceLevel,
    RelevanceConfidence,
    RelevanceReasoning,
    FindingCount,
    AiSummary,
    CommonThemes                    = RelevanceEvidenceCommonThemes,
    DistinctThemes                  = RelevanceEvidenceDistinctThemes,
    AuditCreateTime,
    AuditUpdateTime

Field Validations

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