AWS EC2 Network Access Control List Creation

calendar May 22, 2024 · Domain: Cloud Data Source: AWS Data Source: Amazon Web Services Data Source: AWS EC2 Use Case: Network Security Monitoring Tactic: Persistence  ·
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Identifies the creation of an AWS Elastic Compute Cloud (EC2) network access control list (ACL) or an entry in a network ACL with a specified rule number.

Elastic rule (View on GitHub)

 1[metadata]
 2creation_date = "2020/06/04"
 3integration = ["aws"]
 4maturity = "production"
 5updated_date = "2024/05/21"
 6
 7[rule]
 8author = ["Elastic"]
 9description = """
10Identifies the creation of an AWS Elastic Compute Cloud (EC2) network access control list (ACL) or an entry in a network
11ACL with a specified rule number.
12"""
13false_positives = [
14    """
15    Network ACL's may be created by a network administrator. Verify whether the user identity, user agent, and/or
16    hostname should be making changes in your environment. Network ACL creations by unfamiliar users or hosts should be
17    investigated. If known behavior is causing false positives, it can be exempted from the rule.
18    """,
19]
20from = "now-60m"
21index = ["filebeat-*", "logs-aws.cloudtrail-*"]
22interval = "10m"
23language = "kuery"
24license = "Elastic License v2"
25name = "AWS EC2 Network Access Control List Creation"
26note = """## Setup
27
28The AWS Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule."""
29references = [
30    "https://awscli.amazonaws.com/v2/documentation/api/latest/reference/ec2/create-network-acl.html",
31    "https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateNetworkAcl.html",
32    "https://awscli.amazonaws.com/v2/documentation/api/latest/reference/ec2/create-network-acl-entry.html",
33    "https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_CreateNetworkAclEntry.html",
34]
35risk_score = 21
36rule_id = "39144f38-5284-4f8e-a2ae-e3fd628d90b0"
37severity = "low"
38tags = [
39    "Domain: Cloud",
40    "Data Source: AWS",
41    "Data Source: Amazon Web Services",
42    "Data Source: AWS EC2",
43    "Use Case: Network Security Monitoring",
44    "Tactic: Persistence",
45]
46timestamp_override = "event.ingested"
47type = "query"
48
49query = '''
50event.dataset:aws.cloudtrail and event.provider:ec2.amazonaws.com and event.action:(CreateNetworkAcl or CreateNetworkAclEntry) and event.outcome:success
51'''
52
53
54[[rule.threat]]
55framework = "MITRE ATT&CK"
56[[rule.threat.technique]]
57id = "T1133"
58name = "External Remote Services"
59reference = "https://attack.mitre.org/techniques/T1133/"
60
61
62[rule.threat.tactic]
63id = "TA0003"
64name = "Persistence"
65reference = "https://attack.mitre.org/tactics/TA0003/"

Setup

The AWS Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.

References

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