AWS ConsoleLogin Failed Authentication — Sigma Rule

Rule metadata and linked tags

Author: Ivan Saakov, Nasreddine Bencherchali. Source status: experimental; severity: medium. Source dates: 2025-10-19 / not supplied.

{
  "product": "aws",
  "service": "cloudtrail"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: ca814c8cb7de0f11d39ad93a87bf1b58d70983111af806df58fc3bf1bb1689c1

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: AWS ConsoleLogin Failed Authentication
id: 6393e346-1977-46ef-8987-ad414a145fad
status: experimental
description: |
    Detects failed AWS console login attempts due to authentication failures. Monitoring these events is crucial for identifying potential brute-force attacks or unauthorized access attempts to AWS accounts.
references:
    - https://naikordian.github.io/blog/posts/brute-force-aws-console/
    - https://help.fortinet.com/fsiem/Public_Resource_Access/7_2_1/rules/PH_RULE_AWS_Management_Console_Brute_Force_of_Root_User_Identity.htm
    - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1110.001/aws_login_failure/aws_cloudtrail_events.json
author: Ivan Saakov, Nasreddine Bencherchali
date: 2025-10-19
tags:
    - attack.credential-access
    - attack.t1110
logsource:
    product: aws
    service: cloudtrail
detection:
    selection:
        eventName: 'ConsoleLogin'
        errorMessage: 'Failed authentication'
    condition: selection
falsepositives:
    - Legitimate failed login attempts by authorized users. Investigate the source of repeated failed login attempts.
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate failed login attempts by authorized users. Investigate the source of repeated failed login attempts.

Source references

• https://naikordian.github.io/blog/posts/brute-force-aws-console/
• https://help.fortinet.com/fsiem/Public_Resource_Access/7_2_1/rules/PH_RULE_AWS_Management_Console_Brute_Force_of_Root_User_Identity.htm
• https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1110.001/aws_login_failure/aws_cloudtrail_events.json