Elastic Security Detection Rules

AWS EC2 Route Table Modified or Deleted

Last updated 6 months ago on 2025-02-03
Created 4 years ago on 2021-06-05

About

Identifies AWS CloudTrail events where an EC2 route table or association has been modified or deleted. Route table or association modifications can be used by attackers to disrupt network traffic, reroute communications, or maintain persistence in a compromised environment. This is a [New Terms](https://www.elastic.co/guide/en/security/current/rules-ui-create.html#create-new-terms-rule) rule that detects the first instance of this behavior by the `aws.cloudtrail.user_identity.arn` field in the last 10 days.
Tags
Domain: CloudData Source: AWSData Source: Amazon Web ServicesData Source: AWS EC2Use Case: Network Security MonitoringTactic: PersistenceLanguage: kuery
Severity
low
Risk Score
21
MITRE ATT&CK™

Persistence (TA0003)(opens in a new tab or window)

False Positive Examples
Route Table could be modified or deleted by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. Route Table being modified from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule. Also automated processes that use Terraform may lead to false positives.
License
Elastic License v2(opens in a new tab or window)

Definition

Rule Type
New Terms Rule
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
filebeat-*logs-aws.cloudtrail-*
Related Integrations

aws(opens in a new tab or window)

Query
event.dataset: "aws.cloudtrail"
    and event.provider: "ec2.amazonaws.com"
    and event.action:(
        "ReplaceRoute" or
        "ReplaceRouteTableAssociation" or
        "DeleteRouteTable" or
        "DeleteRoute" or
        "DisassociateRouteTable"
    )
    and event.outcome: "success"
    and not source.address: (
        "cloudformation.amazonaws.com" or
        "servicecatalog.amazonaws.com" or
        "fsx.amazonaws.com"
    )

Install detection rules in Elastic Security

Detect AWS EC2 Route Table Modified or Deleted in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).