AWS EC2 Network Access Control List Deletion

calendar May 22, 2024 · Domain: Cloud Data Source: AWS Data Source: Amazon Web Services Use Case: Network Security Monitoring Tactic: Defense Evasion  ·
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Identifies the deletion of an Amazon Elastic Compute Cloud (EC2) network access control list (ACL) or one of its ingress/egress entries.

Elastic rule (View on GitHub)

 1[metadata]
 2creation_date = "2020/05/26"
 3integration = ["aws"]
 4maturity = "production"
 5updated_date = "2024/05/21"
 6
 7[rule]
 8author = ["Elastic"]
 9description = """
10Identifies the deletion of an Amazon Elastic Compute Cloud (EC2) network access control list (ACL) or one of its
11ingress/egress entries.
12"""
13false_positives = [
14    """
15    Network ACL's may be deleted by a network administrator. Verify whether the user identity, user agent, and/or
16    hostname should be making changes in your environment. Network ACL deletions 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 Deletion"
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/delete-network-acl.html",
31    "https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DeleteNetworkAcl.html",
32    "https://awscli.amazonaws.com/v2/documentation/api/latest/reference/ec2/delete-network-acl-entry.html",
33    "https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DeleteNetworkAclEntry.html",
34]
35risk_score = 47
36rule_id = "8623535c-1e17-44e1-aa97-7a0699c3037d"
37severity = "medium"
38tags = [
39    "Domain: Cloud",
40    "Data Source: AWS",
41    "Data Source: Amazon Web Services",
42    "Use Case: Network Security Monitoring",
43    "Tactic: Defense Evasion",
44]
45timestamp_override = "event.ingested"
46type = "query"
47
48query = '''
49event.dataset:aws.cloudtrail and event.provider:ec2.amazonaws.com and event.action:(DeleteNetworkAcl or DeleteNetworkAclEntry) and event.outcome:success
50'''
51
52
53[[rule.threat]]
54framework = "MITRE ATT&CK"
55[[rule.threat.technique]]
56id = "T1562"
57name = "Impair Defenses"
58reference = "https://attack.mitre.org/techniques/T1562/"
59[[rule.threat.technique.subtechnique]]
60id = "T1562.001"
61name = "Disable or Modify Tools"
62reference = "https://attack.mitre.org/techniques/T1562/001/"
63
64
65
66[rule.threat.tactic]
67id = "TA0005"
68name = "Defense Evasion"
69reference = "https://attack.mitre.org/tactics/TA0005/"

Setup

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

References

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