Vaikora - High severity AI agent action detected | Microsoft Sentinel Analytic Rules

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Id	15c49777-7cb7-4746-8064-6fa4c7a73df8
Rulename	Vaikora - High severity AI agent action detected
Description	Identifies AI agent actions from Vaikora classified as high or critical severity. These events may indicate an agent operating outside safe parameters or triggering policy thresholds.
Severity	High
Tactics	Impact Execution PrivilegeEscalation
Techniques	T1059 T1078 T1548
Required data connectors	VaikoraSentinel
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	GreaterThan
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vaikora-Sentinel/Analytic%20Rules/Vaikora%20-%20High%20Risk%20AI%20Agent%20Action.yaml
Version	1.0.0
Arm template	15c49777-7cb7-4746-8064-6fa4c7a73df8.json

KQL

Vaikora_AgentSignals_CL
| where TimeGenerated > ago(1h)
| where severity_s in ("high", "critical")
| summarize
    ActionCount = count(),
    MaxAnomalyScore = max(anomaly_score_d),
    Actions = make_set(action_type_s),
    PolicyDecisions = make_set(policy_decision_s),
    ResourceTypes = make_set(resource_type_s),
    LogHashes = make_set(log_hash_s)
  by AgentId = agent_id_s, Severity = severity_s
| extend
    ActionList = strcat_array(Actions, ", "),
    PolicyList = strcat_array(PolicyDecisions, ", "),
    ResourceList = strcat_array(ResourceTypes, ", ")

YAML

relevantTechniques:
- T1059
- T1078
- T1548
triggerThreshold: 0
id: 15c49777-7cb7-4746-8064-6fa4c7a73df8
eventGroupingSettings:
  aggregationKind: AlertPerResult
queryPeriod: 1h
triggerOperator: GreaterThan
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    enabled: true
    reopenClosedIncident: false
    matchingMethod: Selected
    groupByEntities:
    - Account
    lookbackDuration: 1h
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Vaikora-Sentinel/Analytic%20Rules/Vaikora%20-%20High%20Risk%20AI%20Agent%20Action.yaml
queryFrequency: 1h
requiredDataConnectors:
- dataTypes:
  - Vaikora_AgentSignals_CL
  connectorId: VaikoraSentinel
version: 1.0.0
tactics:
- Impact
- Execution
- PrivilegeEscalation
query: |
  Vaikora_AgentSignals_CL
  | where TimeGenerated > ago(1h)
  | where severity_s in ("high", "critical")
  | summarize
      ActionCount = count(),
      MaxAnomalyScore = max(anomaly_score_d),
      Actions = make_set(action_type_s),
      PolicyDecisions = make_set(policy_decision_s),
      ResourceTypes = make_set(resource_type_s),
      LogHashes = make_set(log_hash_s)
    by AgentId = agent_id_s, Severity = severity_s
  | extend
      ActionList = strcat_array(Actions, ", "),
      PolicyList = strcat_array(PolicyDecisions, ", "),
      ResourceList = strcat_array(ResourceTypes, ", ")
name: Vaikora - High severity AI agent action detected
severity: High
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: AgentId
suppressionDuration: 1h
suppressionEnabled: false
description: |
  Identifies AI agent actions from Vaikora classified as high or critical severity. These events may indicate an agent operating outside safe parameters or triggering policy thresholds.
customDetails:
  ResourceTypes: ResourceList
  ActionCount: ActionCount
  MaxAnomalyScore: MaxAnomalyScore
  Actions: ActionList
  PolicyDecisions: PolicyList
kind: Scheduled

ARM

{
  "$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/15c49777-7cb7-4746-8064-6fa4c7a73df8')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/15c49777-7cb7-4746-8064-6fa4c7a73df8')]",
      "properties": {
        "alertRuleTemplateName": "15c49777-7cb7-4746-8064-6fa4c7a73df8",
        "customDetails": {
          "ActionCount": "ActionCount",
          "Actions": "ActionList",
          "MaxAnomalyScore": "MaxAnomalyScore",
          "PolicyDecisions": "PolicyList",
          "ResourceTypes": "ResourceList"
        },
        "description": "Identifies AI agent actions from Vaikora classified as high or critical severity. These events may indicate an agent operating outside safe parameters or triggering policy thresholds.\n",
        "displayName": "Vaikora - High severity AI agent action 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-%20High%20Risk%20AI%20Agent%20Action.yaml",
        "query": "Vaikora_AgentSignals_CL\n| where TimeGenerated > ago(1h)\n| where severity_s in (\"high\", \"critical\")\n| summarize\n    ActionCount = count(),\n    MaxAnomalyScore = max(anomaly_score_d),\n    Actions = make_set(action_type_s),\n    PolicyDecisions = make_set(policy_decision_s),\n    ResourceTypes = make_set(resource_type_s),\n    LogHashes = make_set(log_hash_s)\n  by AgentId = agent_id_s, Severity = severity_s\n| extend\n    ActionList = strcat_array(Actions, \", \"),\n    PolicyList = strcat_array(PolicyDecisions, \", \"),\n    ResourceList = strcat_array(ResourceTypes, \", \")\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Execution",
          "Impact",
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1059",
          "T1078",
          "T1548"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}