security_content/data_sources/aws_cloudtrail_createnetworkaclentry.yml at 4da7ab40d87cec390fc053aeffc67f61a138a5aa · pyth0n1c/security_content · GitHub

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name: AWS CloudTrail CreateNetworkAclEntry
id: 45934028-10ec-4ab5-a7b1-a6349b833e67
version: 6
creation_date: '2024-05-22'
modification_date: '2026-07-30'
author: Patrick Bareiss, Splunk
description: Logs the creation of new entries in a network ACL, including rules to allow or deny specific network traffic.
mitre_components:
    - Firewall Rule Modification
    - Network Connection Creation
    - Cloud Service Modification
    - Cloud Service Metadata
source: aws_cloudtrail
sourcetype: aws:cloudtrail
separator: eventName
separator_value: CreateNetworkAclEntry
supported_TA:
    - name: Splunk Add-on for AWS
      url: https://splunkbase.splunk.com/app/1876
      version: 8.2.1
fields:
    - _time
    - action
    - app
    - awsRegion
    - aws_account_id
    - change_type
    - command
    - date_hour
    - date_mday
    - date_minute
    - date_month
    - date_second
    - date_wday
    - date_year
    - date_zone
    - dest
    - direction
    - dvc
    - errorCode
    - eventCategory
    - eventID
    - eventName
    - eventSource
    - eventTime
    - eventType
    - eventVersion
    - eventtype
    - host
    - index
    - linecount
    - managementEvent
    - msg
    - object
    - object_category
    - object_id
    - product
    - protocol
    - protocol_code
    - punct
    - readOnly
    - recipientAccountId
    - region
    - requestID
    - requestParameters.aclProtocol
    - requestParameters.cidrBlock
    - requestParameters.egress
    - requestParameters.networkAclId
    - requestParameters.ruleAction
    - requestParameters.ruleNumber
    - responseElements._return
    - responseElements.requestId
    - rule_action
    - signature
    - source
    - sourceIPAddress
    - sourcetype
    - splunk_server
    - src
    - src_ip
    - src_ip_range
    - start_time
    - status
    - tag
    - tag::eventtype
    - timeendpos
    - timestartpos
    - user
    - userAgent
    - userIdentity.accessKeyId
    - userIdentity.accountId
    - userIdentity.arn
    - userIdentity.principalId
    - userIdentity.sessionContext.attributes.creationDate
    - userIdentity.sessionContext.attributes.mfaAuthenticated
    - userIdentity.sessionContext.sessionIssuer.accountId
    - userIdentity.sessionContext.sessionIssuer.arn
    - userIdentity.sessionContext.sessionIssuer.principalId
    - userIdentity.sessionContext.sessionIssuer.type
    - userIdentity.sessionContext.sessionIssuer.userName
    - userIdentity.type
    - userName
    - user_access_key
    - user_agent
    - user_arn
    - user_group_id
    - user_id
    - user_name
    - user_type
    - vendor
    - vendor_account
    - vendor_product
    - vendor_region
output_fields:
    - dest
    - user
    - user_agent
    - src
    - vendor_account
    - vendor_region
    - vendor_product
example_log: '{"eventVersion": "1.08", "userIdentity": {"type": "AssumedRole", "principalId": "AROAIJIESMXKGCJRCTPR6:pbareiss@splunk.local", "arn": "arn:aws:sts::111111111111:assumed-role/okta_adm_role/pbareiss@splunk.local", "accountId": "111111111111", "accessKeyId": "ASIAYTOGP2RLF3F7BXZK", "sessionContext": {"sessionIssuer": {"type": "Role", "principalId": "AROAIJIESMXKGCJRCTPR6", "arn": "arn:aws:iam::111111111111:role/okta_adm_role", "accountId": "111111111111", "userName": "okta_adm_role"}, "webIdFederationData": {}, "attributes": {"mfaAuthenticated": "false", "creationDate": "2021-01-12T08:36:15Z"}}}, "eventTime": "2021-01-12T08:38:39Z", "eventSource": "ec2.amazonaws.com", "eventName": "CreateNetworkAclEntry", "awsRegion": "eu-central-1", "sourceIPAddress": "95.90.199.65", "userAgent": "console.ec2.amazonaws.com", "requestParameters": {"networkAclId": "acl-078ccebebcbabe175", "ruleNumber": 10, "egress": false, "ruleAction": "allow", "icmpTypeCode": {}, "portRange": {}, "aclProtocol": "-1", "cidrBlock": "0.0.0.0/0"}, "responseElements": {"requestId": "d29c9c32-3a72-48d3-b612-6ba795e9ec64", "_return": true}, "requestID": "d29c9c32-3a72-48d3-b612-6ba795e9ec64", "eventID": "6d1ce00e-4099-463c-8a4d-2af2fb2178ba", "readOnly": false, "eventType": "AwsApiCall", "managementEvent": true, "eventCategory": "Management", "recipientAccountId": "111111111111"}'