Cisco WSA - Multiple attempts to download unwanted file

let threshold = 2;
CiscoWSAEvent
| where DvcAction =~ 'BLOCK_ADMIN_FILE_TYPE'
| summarize i_src = makeset(SrcIpAddr) by UrlOriginal, bin(TimeGenerated, 15m)
| where array_length(i_src) >= threshold
| extend IPCustomEntity = i_src, UrlCustomEntity = UrlOriginal

entityMappings:
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
- entityType: URL
  fieldMappings:
  - identifier: Url
    columnName: UrlCustomEntity
name: Cisco WSA - Multiple attempts to download unwanted file
kind: Scheduled
triggerOperator: gt
status: Available
queryPeriod: 1h
requiredDataConnectors:
- connectorId: SyslogAma
  datatypes:
  - Syslog
tactics:
- InitialAccess
query: |
  let threshold = 2;
  CiscoWSAEvent
  | where DvcAction =~ 'BLOCK_ADMIN_FILE_TYPE'
  | summarize i_src = makeset(SrcIpAddr) by UrlOriginal, bin(TimeGenerated, 15m)
  | where array_length(i_src) >= threshold
  | extend IPCustomEntity = i_src, UrlCustomEntity = UrlOriginal
description: |
  'Detects when multiple attempts to download unwanted file occur.'
severity: Medium
id: 46b6c6fc-2c1a-4270-be10-9d444d83f027
triggerThreshold: 0
queryFrequency: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CiscoWSA/Analytic%20Rules/CiscoWSAMultipleUnwantedFileTypes.yaml
version: 1.0.2
relevantTechniques:
- T1189

{
  "$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/46b6c6fc-2c1a-4270-be10-9d444d83f027')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/46b6c6fc-2c1a-4270-be10-9d444d83f027')]",
      "properties": {
        "alertRuleTemplateName": "46b6c6fc-2c1a-4270-be10-9d444d83f027",
        "customDetails": null,
        "description": "'Detects when multiple attempts to download unwanted file occur.'\n",
        "displayName": "Cisco WSA - Multiple attempts to download unwanted file",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "UrlCustomEntity",
                "identifier": "Url"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/CiscoWSA/Analytic%20Rules/CiscoWSAMultipleUnwantedFileTypes.yaml",
        "query": "let threshold = 2;\nCiscoWSAEvent\n| where DvcAction =~ 'BLOCK_ADMIN_FILE_TYPE'\n| summarize i_src = makeset(SrcIpAddr) by UrlOriginal, bin(TimeGenerated, 15m)\n| where array_length(i_src) >= threshold\n| extend IPCustomEntity = i_src, UrlCustomEntity = UrlOriginal\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1189"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}