Vaikora - Behavioral anomaly detected

Vaikora_AgentSignals_CL
| where TimeGenerated > ago(1h)
| where is_anomaly_b == true
| where anomaly_score_d >= 0.7
| summarize
    AnomalyCount = count(),
    MaxAnomalyScore = max(anomaly_score_d),
    AvgAnomalyScore = avg(anomaly_score_d),
    AnomalyReasons = make_set(anomaly_reason_s),
    ActionTypes = make_set(action_type_s)
  by AgentId = agent_id_s, Severity = severity_s
| extend
    ReasonList = strcat_array(AnomalyReasons, "; "),
    ActionList = strcat_array(ActionTypes, ", ")

tactics:
- DefenseEvasion
- Execution
requiredDataConnectors:
- dataTypes:
  - Vaikora_AgentSignals_CL
  connectorId: VaikoraSentinel
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    groupByEntities:
    - Account
    matchingMethod: Selected
    enabled: true
    reopenClosedIncident: false
    lookbackDuration: 1h
queryPeriod: 1h
kind: Scheduled
severity: Medium
customDetails:
  AnomalyCount: AnomalyCount
  AnomalyReasons: ReasonList
  ActionTypes: ActionList
  AvgAnomalyScore: AvgAnomalyScore
  MaxAnomalyScore: MaxAnomalyScore
queryFrequency: 30m
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vaikora-Sentinel/Analytic%20Rules/Vaikora%20-%20Behavioral%20Anomaly%20Detected.yaml
triggerThreshold: 0
description: |
  Identifies AI agent behavioral anomalies flagged by Vaikora with an anomaly score of 0.7 or above, indicating significant deviation from the agent's established behavioral baseline.
id: e61258ec-1a7f-454c-95b5-458a6edb1ea4
triggerOperator: GreaterThan
status: Available
relevantTechniques:
- T1059
- T1027
suppressionDuration: 30m
version: 1.0.0
suppressionEnabled: false
name: Vaikora - Behavioral anomaly detected
eventGroupingSettings:
  aggregationKind: AlertPerResult
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AgentId
    identifier: Name
query: |
  Vaikora_AgentSignals_CL
  | where TimeGenerated > ago(1h)
  | where is_anomaly_b == true
  | where anomaly_score_d >= 0.7
  | summarize
      AnomalyCount = count(),
      MaxAnomalyScore = max(anomaly_score_d),
      AvgAnomalyScore = avg(anomaly_score_d),
      AnomalyReasons = make_set(anomaly_reason_s),
      ActionTypes = make_set(action_type_s)
    by AgentId = agent_id_s, Severity = severity_s
  | extend
      ReasonList = strcat_array(AnomalyReasons, "; "),
      ActionList = strcat_array(ActionTypes, ", ")

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/e61258ec-1a7f-454c-95b5-458a6edb1ea4')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/e61258ec-1a7f-454c-95b5-458a6edb1ea4')]",
      "properties": {
        "alertRuleTemplateName": "e61258ec-1a7f-454c-95b5-458a6edb1ea4",
        "customDetails": {
          "ActionTypes": "ActionList",
          "AnomalyCount": "AnomalyCount",
          "AnomalyReasons": "ReasonList",
          "AvgAnomalyScore": "AvgAnomalyScore",
          "MaxAnomalyScore": "MaxAnomalyScore"
        },
        "description": "Identifies AI agent behavioral anomalies flagged by Vaikora with an anomaly score of 0.7 or above, indicating significant deviation from the agent's established behavioral baseline.\n",
        "displayName": "Vaikora - Behavioral anomaly detected",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AgentId",
                "identifier": "Name"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "incidentConfiguration": {
          "createIncident": true,
          "groupingConfiguration": {
            "enabled": true,
            "groupByEntities": [
              "Account"
            ],
            "lookbackDuration": "PT1H",
            "matchingMethod": "Selected",
            "reopenClosedIncident": false
          }
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vaikora-Sentinel/Analytic%20Rules/Vaikora%20-%20Behavioral%20Anomaly%20Detected.yaml",
        "query": "Vaikora_AgentSignals_CL\n| where TimeGenerated > ago(1h)\n| where is_anomaly_b == true\n| where anomaly_score_d >= 0.7\n| summarize\n    AnomalyCount = count(),\n    MaxAnomalyScore = max(anomaly_score_d),\n    AvgAnomalyScore = avg(anomaly_score_d),\n    AnomalyReasons = make_set(anomaly_reason_s),\n    ActionTypes = make_set(action_type_s)\n  by AgentId = agent_id_s, Severity = severity_s\n| extend\n    ReasonList = strcat_array(AnomalyReasons, \"; \"),\n    ActionList = strcat_array(ActionTypes, \", \")\n",
        "queryFrequency": "PT30M",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT30M",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion",
          "Execution"
        ],
        "techniques": [
          "T1027",
          "T1059"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}