{
  "$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/467cbe7e-e6d4-4f4e-8e44-84dd01932c32')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/467cbe7e-e6d4-4f4e-8e44-84dd01932c32')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "Detected {{EventName}} for policy {{PolicyName}} in account {{RecipientAccountId}}.",
          "alertDisplayNameFormat": "AWS S3 privilege escalation policy activity: {{PolicyName}} by {{AccountName}}"
        },
        "alertRuleTemplateName": "467cbe7e-e6d4-4f4e-8e44-84dd01932c32",
        "customDetails": {
          "EventName": "EventName",
          "PolicyName": "PolicyName",
          "RecipientAccountId": "RecipientAccountId",
          "UserIdentityArn": "UserIdentityArn"
        },
        "description": "Identifies creation of IAM policies that grant broad Amazon S3 CRUD permissions, followed by policy attachment activity to users, roles, or groups. This sequence can indicate attempts to\nexpand access and should be investigated as potential cloud privilege escalation.\n",
        "displayName": "AWSCloudTrail - Created CRUD S3 policy and then privilege escalation",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountUPNSuffix",
                "identifier": "UPNSuffix"
              },
              {
                "columnName": "RecipientAccountId",
                "identifier": "CloudAppAccountId"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SourceIpAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon%20Web%20Services/Analytic%20Rules/AWS_CreatedCRUDS3PolicytoPrivilegeEscalation.yaml",
        "query": "let EventNameList = dynamic([\"AttachUserPolicy\",\"AttachRolePolicy\",\"AttachGroupPolicy\"]);\nlet createPolicy =  dynamic([\"CreatePolicy\", \"CreatePolicyVersion\"]);\nlet timeframe = 1d;\nlet lookback = 14d;\n// Creating Master table with all the events to use with materialize for better performance\nlet EventInfo = AWSCloudTrail\n| where TimeGenerated >= ago(lookback)\n| where EventName in (EventNameList) or EventName in (createPolicy)\n| extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)\n| extend UserName = tostring(split(UserIdentityArn, '/')[-1])\n| extend AccountName = case( UserIdentityPrincipalid == \"Anonymous\", \"Anonymous\", isempty(UserIdentityUserName), UserName, UserIdentityUserName)\n| extend AccountName = iif(AccountName contains \"@\", tostring(split(AccountName, '@', 0)[0]), AccountName),\n  AccountUPNSuffix = iif(AccountName contains \"@\", tostring(split(AccountName, '@', 1)[0]), \"\");\n//Checking for Policy creation event with Full Admin Privileges since lookback period.\nlet FullAdminPolicyEvents =  materialize(  EventInfo\n| where TimeGenerated >= ago(lookback)\n| where EventName in (createPolicy)\n| extend PolicyName = tostring(parse_json(RequestParameters).policyName)\n| extend Statement = parse_json(tostring((parse_json(RequestParameters).policyDocument))).Statement\n| mvexpand Statement\n| extend Action = parse_json(Statement).Action , Effect = tostring(parse_json(Statement).Effect), Resource = tostring(parse_json(Statement).Resource), Condition = tostring(parse_json(Statement).Condition)\n| extend Action = tostring(Action)\n| where Effect =~ \"Allow\" and (Action contains \"s3:Create\" and Action contains \"s3:Get\" and Action contains \"s3:Put\" and Action contains \"s3:Delete\") and Resource == \"*\" and Condition == \"\"\n| distinct TimeGenerated, EventName, PolicyName, SourceIpAddress, UserIdentityArn, RecipientAccountId, AccountName, AccountUPNSuffix\n| project-rename StartTime = TimeGenerated  );\nlet PolicyAttach = materialize(  EventInfo\n| where TimeGenerated >= ago(timeframe)\n| where EventName in (EventNameList) and isempty(ErrorCode) and isempty(ErrorMessage)\n| extend PolicyName = tostring(split(tostring(parse_json(RequestParameters).policyArn),\"/\")[1])\n| summarize AttachEventCount=count(), StartTime = min(TimeGenerated), EndTime = max(TimeGenerated) by EventSource, EventName, UserIdentityType , UserIdentityArn, SourceIpAddress, RecipientAccountId, AccountName, AccountUPNSuffix, PolicyName\n| extend AttachEvent = pack(\"StartTime\", StartTime, \"EndTime\", EndTime, \"EventName\", EventName, \"UserIdentityType\",   UserIdentityType, \"SourceIpAddress\", SourceIpAddress, \"AccountName\", AccountName, \"AccountUPNSuffix\", AccountUPNSuffix, \"RecipientAccountId\", RecipientAccountId, \"UserIdentityArn\", UserIdentityArn)\n| project EventSource, PolicyName, AttachEvent, AttachEventCount, RecipientAccountId, AccountName, AccountUPNSuffix\n);\n// Joining the list of PolicyNames and checking if it has been attached to any Roles/Users/Groups.\n// These Roles/Users/Groups will be Privileged and can be used by adversaries as pivot point for privilege escalation via multiple ways.\nFullAdminPolicyEvents\n| join kind=leftouter\n(\n    PolicyAttach\n)\non PolicyName\n| project-away PolicyName1\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [
          "T1098.003"
        ],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion",
          "Persistence",
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1098",
          "T1484"
        ],
        "templateVersion": "1.0.3",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}