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Detection rules › Sigma

New Network Route Added

Status
test
Severity
medium
Log source
product aws, service cloudtrail
Author
jamesc-grafana
Source
github.com/SigmaHQ/sigma

Detects the addition of a new network route to a route table in AWS.

Known false positives

  • New VPC Creation requiring setup of a new route table
  • New subnets added requiring routing setup

MITRE ATT&CK coverage

TacticTechniques
Defense Impairment

Telemetry coverage

PlatformRecord / event type
AWSCloudTrail event CreateRoute: Creates a route in a route table within a VPC, specifying the destination CIDR and target.

Rules detecting the same action

These rules filter on the same operation.

Rule body

title: New Network Route Added
id: c803b2ce-c4a2-4836-beae-b112010390b1
status: test
description: |
    Detects the addition of a new network route to a route table in AWS.
references:
    - https://www.gorillastack.com/blog/real-time-events/important-aws-cloudtrail-security-events-tracking/
author: jamesc-grafana
date: 2024-07-11
tags:
    - attack.defense-impairment
    - attack.t1686.001
logsource:
    product: aws
    service: cloudtrail
detection:
    selection:
        eventSource: 'ec2.amazonaws.com'
        eventName: 'CreateRoute'
    condition: selection
falsepositives:
    - New VPC Creation requiring setup of a new route table
    - New subnets added requiring routing setup
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    eventSource: 'ec2.amazonaws.com'
    eventName: 'CreateRoute'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
eventNameeq
  • CreateRoute
field:"aws::eventName" kind:eq value:"CreateRoute"
eventSourceeq
  • ec2.amazonaws.com
field:"aws::eventSource" kind:eq value:"ec2.amazonaws.com"