AWS EC2 Network Access Control List Deletionedit
Identifies the deletion of an Amazon Elastic Compute Cloud (EC2) network access control list (ACL) or one of its ingress/egress entries.
Rule type: query
Rule indices:
- filebeat-*
- logs-aws*
Severity: medium
Risk score: 47
Runs every: 10 minutes
Searches indices from: now-60m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
- https://awscli.amazonaws.com/v2/documentation/api/latest/reference/ec2/delete-network-acl.html
- https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DeleteNetworkAcl.html
- https://awscli.amazonaws.com/v2/documentation/api/latest/reference/ec2/delete-network-acl-entry.html
- https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DeleteNetworkAclEntry.html
Tags:
- Elastic
- Cloud
- AWS
- Continuous Monitoring
- SecOps
- Network Security
Version: 101 (version history)
Added (Elastic Stack release): 7.9.0
Last modified (Elastic Stack release): 8.6.0
Rule authors: Elastic
Rule license: Elastic License v2
Potential false positivesedit
Network ACL’s may be deleted by a network administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. Network ACL deletions by unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
Investigation guideedit
Rule queryedit
event.dataset:aws.cloudtrail and event.provider:ec2.amazonaws.com and event.action:(DeleteNetworkAcl or DeleteNetworkAclEntry) and event.outcome:success
Threat mappingedit
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
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Technique:
- Name: Impair Defenses
- ID: T1562
- Reference URL: https://attack.mitre.org/techniques/T1562/
Rule version historyedit
- Version 101 (8.6.0 release)
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- Formatting only
- Version 100 (8.5.0 release)
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- Formatting only
- Version 9 (8.4.0 release)
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- Formatting only
- Version 7 (8.1.0 release)
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- Formatting only
- Version 6 (7.13.0 release)
-
-
Updated query, changed from:
event.action:(DeleteNetworkAcl or DeleteNetworkAclEntry) and event.dataset:aws.cloudtrail and event.provider:ec2.amazonaws.com and event.outcome:success
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- Version 5 (7.12.0 release)
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- Formatting only
- Version 4 (7.11.2 release)
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- Formatting only
- Version 3 (7.11.0 release)
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- Formatting only
- Version 2 (7.10.0 release)
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- Formatting only