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 failed console authentication attempts to decrease the lead time in detecting brute force attempts and identify source IPs for event correlation.

Remediation

For instructions on setting up CloudWatch metric filters and alarms for failed console authentication attempts, refer to the AWS CloudWatch Alarms for CloudTrail User Guide.

aws logs put-metric-filter --log-group-name <cloudtrail_log_group_name> \
--filter-name <console_signin_failure_metric> --metric-transformations \
metricName=<console_signin_failure_metric>,metricNamespace='CISBenchmark',metricValue=1 \
--filter-pattern '{ ($.eventName = ConsoleLogin) && ($.errorMessage = "Failed authentication") }'

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