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')

queryPeriod: 5m
version: 1.0.0
customDetails:
  Application: ApplicationProtocol
  Details: AdditionalExtensions
  Attack: Activity
  AgentVersion: DeviceVersion
  Agent: DeviceProduct
relevantTechniques:
- T1566
queryFrequency: 5m
kind: Scheduled
name: Contrast Blocks
id: 4396f8c3-d114-4154-9f4c-048ba522ed04
entityMappings:
- fieldMappings:
  - columnName: SourceIP
    identifier: Address
  entityType: IP
- fieldMappings:
  - columnName: RequestURL
    identifier: Url
  entityType: URL
- fieldMappings:
  - columnName: ApplicationProtocol
    identifier: Name
  entityType: CloudApplication
- fieldMappings:
  - columnName: Activity
    identifier: Name
  - columnName: Rule
    identifier: Category
  entityType: Malware
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Contrast Protect/Analytic Rules/ContrastBlocks.yaml
severity: Low
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')  
tactics:
- InitialAccess
- Exfiltration
description: |
    'Creates Incidents for Blocked events sourced from the Contrast Protect agent.'
requiredDataConnectors:
- connectorId: ContrastProtect
  dataTypes:
  - CommonSecurityLog
status: Available
triggerThreshold: 0
triggerOperator: gt

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/4396f8c3-d114-4154-9f4c-048ba522ed04')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/4396f8c3-d114-4154-9f4c-048ba522ed04')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Contrast Blocks",
        "description": "'Creates Incidents for Blocked events sourced from the Contrast Protect agent.'\n",
        "severity": "Low",
        "enabled": true,
        "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",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess",
          "Exfiltration"
        ],
        "techniques": [
          "T1566"
        ],
        "alertRuleTemplateName": "4396f8c3-d114-4154-9f4c-048ba522ed04",
        "customDetails": {
          "AgentVersion": "DeviceVersion",
          "Attack": "Activity",
          "Details": "AdditionalExtensions",
          "Application": "ApplicationProtocol",
          "Agent": "DeviceProduct"
        },
        "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"
          }
        ],
        "status": "Available",
        "templateVersion": "1.0.0",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Contrast Protect/Analytic Rules/ContrastBlocks.yaml"
      }
    }
  ]
}