At Teachme Biz, we use AWS Fargate as the execution environment for our applications. The defense of the OS layer, which is typically subject to virus protection software for intrusion detection and prevention, is implemented by Amazon Web Services (hereafter referred to as AWS). Additionally, our 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 operational updates of definition files, as these are outside our company's jurisdiction due to the infrastructure configuration, we are unable to provide an answer.