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AWS Root Login Without MFA

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AWS Root Login Without MFA

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Identifies attempts to login to AWS as the root user without using multi-factor authentication (MFA). Amazon AWS best practices indicate that the root user should be protected by MFA.

Rule type: query

Rule indices:

filebeat-*

Severity: low

Risk score: 21

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://docs.aws.amazon.com/IAM/latest/UserGuide/id_root-user.html

Tags:

AWS
Elastic
SecOps
Identity and Access
Continuous Monitoring

Version: 1

Added (Elastic Stack release): 7.9.0

Rule authors: Elastic

Rule license: Elastic License

Potential false positives

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Some organizations allow root-user logins without MFA, however this is not considered best practice by AWS and increases the risk of compromised credentials.

Investigation guide

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The AWS Filebeat module must be enabled to use this rule.

Rule query

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event.module:aws and event.dataset:aws.cloudtrail and
event.provider:signin.amazonaws.com and event.action:ConsoleLogin and
aws.cloudtrail.user_identity.type:Root and
aws.cloudtrail.console_login.additional_eventdata.mfa_used:false and
event.outcome:success

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
Technique:
- Name: Valid Accounts
- ID: T1078
- Reference URL: https://attack.mitre.org/techniques/T1078/

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