Silverfort - Log4Shell Incident

CommonSecurityLog 
| where DeviceVendor has 'Silverfort'
| where DeviceProduct has 'Admin Console'
| where DeviceEventClassID == "NewIncident"
| where Message has "Log4Shell"
| extend UserName = parse_json(replace('^""|""$', '', Message))['userName']

relevantTechniques:
- T1190
name: Silverfort - Log4Shell Incident
requiredDataConnectors:
- dataTypes:
  - CommonSecurityLog
  connectorId: SilverfortAma
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: UserName
  entityType: Account
query: |-
  CommonSecurityLog 
  | where DeviceVendor has 'Silverfort'
  | where DeviceProduct has 'Admin Console'
  | where DeviceEventClassID == "NewIncident"
  | where Message has "Log4Shell"
  | extend UserName = parse_json(replace('^""|""$', '', Message))['userName']  
id: d6abed70-4043-46da-9304-a98f3446fa5f
tactics:
- InitialAccess
version: 1.0.0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Silverfort/Analytic Rules/Log4Shell.yaml
queryPeriod: 15m
kind: Scheduled
triggerThreshold: 0
queryFrequency: 15m
severity: High
description: |
    'Vulnerability allows attackers to execute arbitrary code on affected systems by exploiting a flaw in the way Log4j handles log messages containing specially crafted strings'
triggerOperator: gt

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/d6abed70-4043-46da-9304-a98f3446fa5f')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/d6abed70-4043-46da-9304-a98f3446fa5f')]",
      "properties": {
        "alertRuleTemplateName": "d6abed70-4043-46da-9304-a98f3446fa5f",
        "customDetails": null,
        "description": "'Vulnerability allows attackers to execute arbitrary code on affected systems by exploiting a flaw in the way Log4j handles log messages containing specially crafted strings'\n",
        "displayName": "Silverfort - Log4Shell Incident",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "UserName",
                "identifier": "Name"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Silverfort/Analytic Rules/Log4Shell.yaml",
        "query": "CommonSecurityLog \n| where DeviceVendor has 'Silverfort'\n| where DeviceProduct has 'Admin Console'\n| where DeviceEventClassID == \"NewIncident\"\n| where Message has \"Log4Shell\"\n| extend UserName = parse_json(replace('^\"\"|\"\"$', '', Message))['userName']",
        "queryFrequency": "PT15M",
        "queryPeriod": "PT15M",
        "severity": "High",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1190"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}