Trend Micro CAS - Ransomware outbreak

TrendMicroCAS
| where EventType =~ 'ransomware'
| summarize count() by DstUserName, bin(TimeGenerated, 2m)
| where count_ >= 2
| extend AccountCustomEntity = DstUserName

relevantTechniques:
- T1486
name: Trend Micro CAS - Ransomware outbreak
requiredDataConnectors:
- dataTypes:
  - TrendMicroCAS
  connectorId: TrendMicroCAS
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountCustomEntity
  entityType: Account
triggerThreshold: 0
id: 38e043ce-a1fd-497b-8d4f-ce5ca2db90cd
tactics:
- Impact
version: 1.0.1
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Trend Micro Cloud App Security/Analytic Rules/TrendMicroCASRansomwareOutbreak.yaml
queryPeriod: 10m
kind: Scheduled
queryFrequency: 10m
severity: High
status: Available
description: |
    'Triggeres when ransomware was detected on several accounts.'
query: |
  TrendMicroCAS
  | where EventType =~ 'ransomware'
  | summarize count() by DstUserName, bin(TimeGenerated, 2m)
  | where count_ >= 2
  | extend AccountCustomEntity = DstUserName  
triggerOperator: gt

{
  "$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/38e043ce-a1fd-497b-8d4f-ce5ca2db90cd')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/38e043ce-a1fd-497b-8d4f-ce5ca2db90cd')]",
      "properties": {
        "alertRuleTemplateName": "38e043ce-a1fd-497b-8d4f-ce5ca2db90cd",
        "customDetails": null,
        "description": "'Triggeres when ransomware was detected on several accounts.'\n",
        "displayName": "Trend Micro CAS - Ransomware outbreak",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "Name"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Trend Micro Cloud App Security/Analytic Rules/TrendMicroCASRansomwareOutbreak.yaml",
        "query": "TrendMicroCAS\n| where EventType =~ 'ransomware'\n| summarize count() by DstUserName, bin(TimeGenerated, 2m)\n| where count_ >= 2\n| extend AccountCustomEntity = DstUserName\n",
        "queryFrequency": "PT10M",
        "queryPeriod": "PT10M",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1486"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}