Privilege escalation via CRUD DynamoDB policy

AWSCloudTrail
| where EventName in ("PutUserPolicy","PutRolePolicy","PutGroupPolicy") and isempty(ErrorCode) and isempty(ErrorMessage)
| extend PolicyName = tostring(parse_json(RequestParameters).policyName)
| extend Statement = parse_json(tostring((parse_json(RequestParameters).policyDocument))).Statement
| mvexpand Statement
| extend Action = parse_json(Statement).Action , Effect = tostring(parse_json(Statement).Effect), Resource = tostring(parse_json(Statement).Resource), Condition = tostring(parse_json(Statement).Condition)
| extend Action = tostring(Action)
| where Effect =~ "Allow" and ((Action contains "dynamodb:Create" or Action contains "dynamodb:Put") and (Action contains "dynamodb:Describe" or Action contains "dynamodb:Get" or Action contains "dynamodb:Scan")  and Action contains "dynamodb:Update" and Action contains "dynamodb:Delete") and Resource == "*" and Condition == ""
| distinct TimeGenerated, EventName, PolicyName, SourceIpAddress, UserIdentityArn, UserIdentityUserName
| extend UserIdentityUserName = iff(isnotempty(UserIdentityUserName), UserIdentityUserName, tostring(split(UserIdentityArn,'/')[-1]))
| extend timestamp = TimeGenerated, IPCustomEntity = SourceIpAddress, AccountCustomEntity = UserIdentityUserName

kind: Scheduled
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_PrivilegeEscalationviaCRUDDynamoDB.yaml
severity: Medium
name: Privilege escalation via CRUD DynamoDB policy
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
relevantTechniques:
- T1484
queryFrequency: 1d
triggerThreshold: 0
queryPeriod: 1d
description: |
    'Detected usage of AttachUserPolicy/AttachGroupPolicy/AttachRolePolicy by CRUD DynamoDB Policy. Attackers could use these operations for privilege escalation. Verify these actions with the user.'
id: b9be2aa6-911d-4131-8658-d2a537ed49f4
version: 1.0.0
tactics:
- PrivilegeEscalation
query: |
  AWSCloudTrail
  | where EventName in ("PutUserPolicy","PutRolePolicy","PutGroupPolicy") and isempty(ErrorCode) and isempty(ErrorMessage)
  | extend PolicyName = tostring(parse_json(RequestParameters).policyName)
  | extend Statement = parse_json(tostring((parse_json(RequestParameters).policyDocument))).Statement
  | mvexpand Statement
  | extend Action = parse_json(Statement).Action , Effect = tostring(parse_json(Statement).Effect), Resource = tostring(parse_json(Statement).Resource), Condition = tostring(parse_json(Statement).Condition)
  | extend Action = tostring(Action)
  | where Effect =~ "Allow" and ((Action contains "dynamodb:Create" or Action contains "dynamodb:Put") and (Action contains "dynamodb:Describe" or Action contains "dynamodb:Get" or Action contains "dynamodb:Scan")  and Action contains "dynamodb:Update" and Action contains "dynamodb:Delete") and Resource == "*" and Condition == ""
  | distinct TimeGenerated, EventName, PolicyName, SourceIpAddress, UserIdentityArn, UserIdentityUserName
  | extend UserIdentityUserName = iff(isnotempty(UserIdentityUserName), UserIdentityUserName, tostring(split(UserIdentityArn,'/')[-1]))
  | extend timestamp = TimeGenerated, IPCustomEntity = SourceIpAddress, AccountCustomEntity = UserIdentityUserName  
status: Available
requiredDataConnectors:
- dataTypes:
  - AWSCloudTrail
  connectorId: AWS
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/b9be2aa6-911d-4131-8658-d2a537ed49f4')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/b9be2aa6-911d-4131-8658-d2a537ed49f4')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Privilege escalation via CRUD DynamoDB policy",
        "description": "'Detected usage of AttachUserPolicy/AttachGroupPolicy/AttachRolePolicy by CRUD DynamoDB Policy. Attackers could use these operations for privilege escalation. Verify these actions with the user.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "AWSCloudTrail\n| where EventName in (\"PutUserPolicy\",\"PutRolePolicy\",\"PutGroupPolicy\") and isempty(ErrorCode) and isempty(ErrorMessage)\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 \"dynamodb:Create\" or Action contains \"dynamodb:Put\") and (Action contains \"dynamodb:Describe\" or Action contains \"dynamodb:Get\" or Action contains \"dynamodb:Scan\")  and Action contains \"dynamodb:Update\" and Action contains \"dynamodb:Delete\") and Resource == \"*\" and Condition == \"\"\n| distinct TimeGenerated, EventName, PolicyName, SourceIpAddress, UserIdentityArn, UserIdentityUserName\n| extend UserIdentityUserName = iff(isnotempty(UserIdentityUserName), UserIdentityUserName, tostring(split(UserIdentityArn,'/')[-1]))\n| extend timestamp = TimeGenerated, IPCustomEntity = SourceIpAddress, AccountCustomEntity = UserIdentityUserName\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1484"
        ],
        "alertRuleTemplateName": "b9be2aa6-911d-4131-8658-d2a537ed49f4",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "identifier": "FullName",
                "columnName": "AccountCustomEntity"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_PrivilegeEscalationviaCRUDDynamoDB.yaml",
        "status": "Available",
        "templateVersion": "1.0.0"
      }
    }
  ]
}