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") }'

aws cloudwatch put-metric-alarm \
    --alarm-name <no_mfa_console_signin_alarm> \
    --metric-name <no_mfa_console_signin_metric> \
    --namespace "CISBenchmark" \
    --statistic "Sum" \
    --period 300 \
    --threshold 1 \
    --evaluation-periods 1 \
    --comparison-operator GreaterThanOrEqualToThreshold \
    --alarm-actions <sns_topic_arn>

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