AWS Management Console sign-ins without MFA should be monitored

aws_logging_log_metric
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Description

Real-time monitoring of API calls can be achieved by directing CloudTrail logs to CloudWatch logs and establishing corresponding metric filters and alarms. It is recommended to set up a metric filter and alarm for console logins not protected by multi-factor authentication (MFA) to increase visibility into potentially at-risk accounts.

Remediation

For instructions on setting up CloudWatch metric filters and alarms for logins without MFA, refer to the AWS CloudWatch Alarms for CloudTrail User Guide.

aws logs put-metric-filter --log-group-name <cloudtrail_log_group_name> \
--filter-name <no_mfa_console_signin_metric> --metric-transformations \
metricName=<no_mfa_console_signin_metric>,metricNamespace=CISBenchmark,metricValue=1 \
--filter-pattern '{ ($.eventName = "ConsoleLogin") && ($.additionalEventData.MFAUsed != "Yes") && \
($.userIdentity.type = "IAMUser") && ($.responseElements.ConsoleLogin = "Success") }'

You can choose your own metricName and metricNamespace strings. Use the same metricNamespace for all Foundations Benchmark metrics to group them together.