Teachme Biz uses AWS Fargate as the application execution environment, but the OS layer defense, which is typically the target of virus protection software for intrusion detection and prevention, is implemented by Amazon Web Services (hereinafter referred to as AWS). Additionally, databases, storage, and mail servers all utilize AWS managed services (Amazon Aurora, Amazon S3, Amazon SES), so they are similarly managed by AWS.
Regarding the updating of definition files, etc., we are unable to provide an answer as it is outside our jurisdiction due to the infrastructure configuration.