Network ACL with all the open ports to a specified CIDR

AWSCloudTrail
| where EventName in ('CreateNetworkAclEntry', 'ReplaceNetworkAclEntry') and isempty(ErrorMessage) and isempty(ErrorCode)
| extend ruleAction = tostring(parse_json(RequestParameters)['ruleAction']),
         egress=parse_json(RequestParameters)['egress'],
         total_ports=(toint(parse_json(parse_json(RequestParameters)['portRange'])['to']) - toint(parse_json(parse_json(RequestParameters)['portRange'])['from'])),
         aclProtocol=parse_json(RequestParameters)['aclProtocol']
| where isnotempty(total_ports)
| where ruleAction == 'allow' and egress == false and (aclProtocol == '-1' or (total_ports > 1024))
| extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)
| extend UserName = tostring(split(UserIdentityArn, '/')[-1])
| extend AccountName = case( UserIdentityPrincipalid == "Anonymous", "Anonymous", isempty(UserIdentityUserName), UserName, UserIdentityUserName)
| extend AccountName = iif(AccountName contains "@", tostring(split(AccountName, '@', 0)[0]), AccountName),
  AccountUPNSuffix = iif(AccountName contains "@", tostring(split(AccountName, '@', 1)[0]), "")
| extend timestamp = TimeGenerated

queryPeriod: 1d
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountUPNSuffix
  - identifier: CloudAppAccountId
    columnName: RecipientAccountId
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: SourceIpAddress
  entityType: IP
relevantTechniques:
- T1562
severity: High
requiredDataConnectors:
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
id: f8ea7d50-e33b-4b9d-9c3e-a59fcbcee281
triggerOperator: gt
kind: Scheduled
query: |
  AWSCloudTrail
  | where EventName in ('CreateNetworkAclEntry', 'ReplaceNetworkAclEntry') and isempty(ErrorMessage) and isempty(ErrorCode)
  | extend ruleAction = tostring(parse_json(RequestParameters)['ruleAction']),
           egress=parse_json(RequestParameters)['egress'],
           total_ports=(toint(parse_json(parse_json(RequestParameters)['portRange'])['to']) - toint(parse_json(parse_json(RequestParameters)['portRange'])['from'])),
           aclProtocol=parse_json(RequestParameters)['aclProtocol']
  | where isnotempty(total_ports)
  | where ruleAction == 'allow' and egress == false and (aclProtocol == '-1' or (total_ports > 1024))
  | extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)
  | extend UserName = tostring(split(UserIdentityArn, '/')[-1])
  | extend AccountName = case( UserIdentityPrincipalid == "Anonymous", "Anonymous", isempty(UserIdentityUserName), UserName, UserIdentityUserName)
  | extend AccountName = iif(AccountName contains "@", tostring(split(AccountName, '@', 0)[0]), AccountName),
    AccountUPNSuffix = iif(AccountName contains "@", tostring(split(AccountName, '@', 1)[0]), "")
  | extend timestamp = TimeGenerated  
tactics:
- DefenseEvasion
triggerThreshold: 0
queryFrequency: 1d
status: Available
description: |
    'Detected network ACL with all the ports open to a specified CIDR. This could lead to potential lateral movements or initial access attacks. Make sure to mitigate this risk.'
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_NetworkACLOpenToAllPorts.yaml
name: Network ACL with all the open ports to a specified CIDR
version: 1.0.2

{
  "$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/f8ea7d50-e33b-4b9d-9c3e-a59fcbcee281')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/f8ea7d50-e33b-4b9d-9c3e-a59fcbcee281')]",
      "properties": {
        "alertRuleTemplateName": "f8ea7d50-e33b-4b9d-9c3e-a59fcbcee281",
        "customDetails": null,
        "description": "'Detected network ACL with all the ports open to a specified CIDR. This could lead to potential lateral movements or initial access attacks. Make sure to mitigate this risk.'\n",
        "displayName": "Network ACL with all the open ports to a specified CIDR",
        "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 Web Services/Analytic Rules/AWS_NetworkACLOpenToAllPorts.yaml",
        "query": "AWSCloudTrail\n| where EventName in ('CreateNetworkAclEntry', 'ReplaceNetworkAclEntry') and isempty(ErrorMessage) and isempty(ErrorCode)\n| extend ruleAction = tostring(parse_json(RequestParameters)['ruleAction']),\n         egress=parse_json(RequestParameters)['egress'],\n         total_ports=(toint(parse_json(parse_json(RequestParameters)['portRange'])['to']) - toint(parse_json(parse_json(RequestParameters)['portRange'])['from'])),\n         aclProtocol=parse_json(RequestParameters)['aclProtocol']\n| where isnotempty(total_ports)\n| where ruleAction == 'allow' and egress == false and (aclProtocol == '-1' or (total_ports > 1024))\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| extend timestamp = TimeGenerated\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion"
        ],
        "techniques": [
          "T1562"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}