User impersonation by Identity Protection alerts

// Retrieve SecurityAlerts generated within the last day
 SecurityAlert 
 // Filter alerts for Azure Active Directory Identity Protection and High severity
 | where ProductName has "Azure Active Directory Identity Protection"
 | where AlertSeverity == "High"
 // Extract IP address entities from the 'Entities' field
 | extend ipAddress = extract(@'\b(?:\d{1,3}\.){3}\d{1,3}\b', 0, Entities)
 // Filter out alerts without IP address entities
 | where isnotempty(ipAddress)
 // Summarize entities per unique combination of attributes
 | summarize make_set(Entities)
     by
     AlertTime = TimeGenerated,
     ipAddress,
     AlertName,
     ProductName,
     AlertSeverity
 // Perform an inner join with AWS CloudTrail events
 | join kind=inner (
     AWSCloudTrail
     | where isempty(ErrorMessage)
     | extend UserType = tostring(parse_json(RequestParameters).userType) 
     | where EventName in~ ("CreateRole", "DeleteRole", "CreateUser", "CreateAccessKey", "DeleteAccessKey", "CreateGroup", "AddUserToGroup", "ChangePassword", "DeleteGroup", "DeleteUser", "RemoveUserFromGroup", "CreateVirtualMFADevice", "DeleteLoginProfile") 
     | summarize
         make_set(RequestParameters),
         make_set(ResponseElements)
         by
         SourceIpAddress,
         UserIdentityArn,
         UserIdentityType,
         EventName,
         EventTime = TimeGenerated
     )
     on $left.ipAddress == $right.SourceIpAddress  
 // Filter results based on temporal correlation
 | where AlertTime between ((EventTime - 1h) .. (EventTime + 1h))

name: User impersonation by Identity Protection alerts
triggerOperator: gt
query: |
  // Retrieve SecurityAlerts generated within the last day
   SecurityAlert 
   // Filter alerts for Azure Active Directory Identity Protection and High severity
   | where ProductName has "Azure Active Directory Identity Protection"
   | where AlertSeverity == "High"
   // Extract IP address entities from the 'Entities' field
   | extend ipAddress = extract(@'\b(?:\d{1,3}\.){3}\d{1,3}\b', 0, Entities)
   // Filter out alerts without IP address entities
   | where isnotempty(ipAddress)
   // Summarize entities per unique combination of attributes
   | summarize make_set(Entities)
       by
       AlertTime = TimeGenerated,
       ipAddress,
       AlertName,
       ProductName,
       AlertSeverity
   // Perform an inner join with AWS CloudTrail events
   | join kind=inner (
       AWSCloudTrail
       | where isempty(ErrorMessage)
       | extend UserType = tostring(parse_json(RequestParameters).userType) 
       | where EventName in~ ("CreateRole", "DeleteRole", "CreateUser", "CreateAccessKey", "DeleteAccessKey", "CreateGroup", "AddUserToGroup", "ChangePassword", "DeleteGroup", "DeleteUser", "RemoveUserFromGroup", "CreateVirtualMFADevice", "DeleteLoginProfile") 
       | summarize
           make_set(RequestParameters),
           make_set(ResponseElements)
           by
           SourceIpAddress,
           UserIdentityArn,
           UserIdentityType,
           EventName,
           EventTime = TimeGenerated
       )
       on $left.ipAddress == $right.SourceIpAddress  
   // Filter results based on temporal correlation
   | where AlertTime between ((EventTime - 1h) .. (EventTime + 1h))
queryFrequency: 1d
description: |
  'This detection focuses on identifying user-related events involving IAM roles, groups, user access, and password changes. It examines instances where the user's IP address matches and alerts generated by Identity Protection share the same IP address. The analysis occurs within a time window of 1 hour, helping to flag potential cases of user impersonation.'
id: 11c3d541-5fa5-49df-8218-d1c98584473b
triggerThreshold: 0
queryPeriod: 1d
version: 1.0.0
kind: Scheduled
customDetails:
  AlertName: AlertName
  AlertIp: ipAddress
  AWSUser: UserIdentityArn
relevantTechniques:
- T1134
severity: Medium
requiredDataConnectors:
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
- connectorId: AzureActiveDirectoryIdentityProtection
  dataTypes:
  - SecurityAlert (IPC)
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Multi%20Cloud%20Attack%20Coverage%20Essentials%20-%20Resource%20Abuse/Analytic%20Rules/UserImpersonateByAAID.yaml
tactics:
- PrivilegeEscalation
entityMappings:
- fieldMappings:
  - identifier: Address
    columnName: SourceIpAddress
  entityType: IP

{
  "$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/11c3d541-5fa5-49df-8218-d1c98584473b')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/11c3d541-5fa5-49df-8218-d1c98584473b')]",
      "properties": {
        "alertRuleTemplateName": "11c3d541-5fa5-49df-8218-d1c98584473b",
        "customDetails": {
          "AlertIp": "ipAddress",
          "AlertName": "AlertName",
          "AWSUser": "UserIdentityArn"
        },
        "description": "'This detection focuses on identifying user-related events involving IAM roles, groups, user access, and password changes. It examines instances where the user's IP address matches and alerts generated by Identity Protection share the same IP address. The analysis occurs within a time window of 1 hour, helping to flag potential cases of user impersonation.'\n",
        "displayName": "User impersonation by Identity Protection alerts",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SourceIpAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Multi%20Cloud%20Attack%20Coverage%20Essentials%20-%20Resource%20Abuse/Analytic%20Rules/UserImpersonateByAAID.yaml",
        "query": "// Retrieve SecurityAlerts generated within the last day\n SecurityAlert \n // Filter alerts for Azure Active Directory Identity Protection and High severity\n | where ProductName has \"Azure Active Directory Identity Protection\"\n | where AlertSeverity == \"High\"\n // Extract IP address entities from the 'Entities' field\n | extend ipAddress = extract(@'\\b(?:\\d{1,3}\\.){3}\\d{1,3}\\b', 0, Entities)\n // Filter out alerts without IP address entities\n | where isnotempty(ipAddress)\n // Summarize entities per unique combination of attributes\n | summarize make_set(Entities)\n     by\n     AlertTime = TimeGenerated,\n     ipAddress,\n     AlertName,\n     ProductName,\n     AlertSeverity\n // Perform an inner join with AWS CloudTrail events\n | join kind=inner (\n     AWSCloudTrail\n     | where isempty(ErrorMessage)\n     | extend UserType = tostring(parse_json(RequestParameters).userType) \n     | where EventName in~ (\"CreateRole\", \"DeleteRole\", \"CreateUser\", \"CreateAccessKey\", \"DeleteAccessKey\", \"CreateGroup\", \"AddUserToGroup\", \"ChangePassword\", \"DeleteGroup\", \"DeleteUser\", \"RemoveUserFromGroup\", \"CreateVirtualMFADevice\", \"DeleteLoginProfile\") \n     | summarize\n         make_set(RequestParameters),\n         make_set(ResponseElements)\n         by\n         SourceIpAddress,\n         UserIdentityArn,\n         UserIdentityType,\n         EventName,\n         EventTime = TimeGenerated\n     )\n     on $left.ipAddress == $right.SourceIpAddress  \n // Filter results based on temporal correlation\n | where AlertTime between ((EventTime - 1h) .. (EventTime + 1h))\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "Medium",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1134"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}