Contrast Blocks

let extract_data=(a:string, k:string) {
  parse_urlquery(replace(@';', @'&', a))["Query Parameters"][k]
};

CommonSecurityLog 
| where DeviceVendor == "Contrast Security"
| where AdditionalExtensions contains "BLOCKED"
| extend DeviceProduct
| extend SourceIP
| extend DeviceVersion
| extend Activity
| extend ApplicationProtocol
| extend RequestURL
| extend RequestMethod
| extend Rule = extract_data(AdditionalExtensions, 'pri')

relevantTechniques:
- T1566
name: Contrast Blocks
requiredDataConnectors:
- dataTypes:
  - CommonSecurityLog
  connectorId: ContrastProtect
- dataTypes:
  - CommonSecurityLog
  connectorId: ContrastProtectAma
- dataTypes:
  - CommonSecurityLog
  connectorId: CefAma
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: SourceIP
  entityType: IP
- fieldMappings:
  - identifier: Url
    columnName: RequestURL
  entityType: URL
- fieldMappings:
  - identifier: Name
    columnName: ApplicationProtocol
  entityType: CloudApplication
- fieldMappings:
  - identifier: Name
    columnName: Activity
  - identifier: Category
    columnName: Rule
  entityType: Malware
triggerThreshold: 0
id: 4396f8c3-d114-4154-9f4c-048ba522ed04
tactics:
- InitialAccess
- Exfiltration
version: 1.0.2
customDetails:
  Attack: Activity
  Application: ApplicationProtocol
  Details: AdditionalExtensions
  Agent: DeviceProduct
  AgentVersion: DeviceVersion
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Contrast Protect/Analytic Rules/ContrastBlocks.yaml
queryPeriod: 5m
kind: Scheduled
queryFrequency: 5m
severity: Low
status: Available
description: |
    'Creates Incidents for Blocked events sourced from the Contrast Protect agent.'
query: |
  let extract_data=(a:string, k:string) {
    parse_urlquery(replace(@';', @'&', a))["Query Parameters"][k]
  };

  CommonSecurityLog 
  | where DeviceVendor == "Contrast Security"
  | where AdditionalExtensions contains "BLOCKED"
  | extend DeviceProduct
  | extend SourceIP
  | extend DeviceVersion
  | extend Activity
  | extend ApplicationProtocol
  | extend RequestURL
  | extend RequestMethod
  | extend Rule = extract_data(AdditionalExtensions, 'pri')  
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/4396f8c3-d114-4154-9f4c-048ba522ed04')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4396f8c3-d114-4154-9f4c-048ba522ed04')]",
      "properties": {
        "alertRuleTemplateName": "4396f8c3-d114-4154-9f4c-048ba522ed04",
        "customDetails": {
          "Agent": "DeviceProduct",
          "AgentVersion": "DeviceVersion",
          "Application": "ApplicationProtocol",
          "Attack": "Activity",
          "Details": "AdditionalExtensions"
        },
        "description": "'Creates Incidents for Blocked events sourced from the Contrast Protect agent.'\n",
        "displayName": "Contrast Blocks",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SourceIP",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "URL",
            "fieldMappings": [
              {
                "columnName": "RequestURL",
                "identifier": "Url"
              }
            ]
          },
          {
            "entityType": "CloudApplication",
            "fieldMappings": [
              {
                "columnName": "ApplicationProtocol",
                "identifier": "Name"
              }
            ]
          },
          {
            "entityType": "Malware",
            "fieldMappings": [
              {
                "columnName": "Activity",
                "identifier": "Name"
              },
              {
                "columnName": "Rule",
                "identifier": "Category"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Contrast Protect/Analytic Rules/ContrastBlocks.yaml",
        "query": "let extract_data=(a:string, k:string) {\n  parse_urlquery(replace(@';', @'&', a))[\"Query Parameters\"][k]\n};\n\nCommonSecurityLog \n| where DeviceVendor == \"Contrast Security\"\n| where AdditionalExtensions contains \"BLOCKED\"\n| extend DeviceProduct\n| extend SourceIP\n| extend DeviceVersion\n| extend Activity\n| extend ApplicationProtocol\n| extend RequestURL\n| extend RequestMethod\n| extend Rule = extract_data(AdditionalExtensions, 'pri')\n",
        "queryFrequency": "PT5M",
        "queryPeriod": "PT5M",
        "severity": "Low",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Exfiltration",
          "InitialAccess"
        ],
        "techniques": [
          "T1566"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}