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Hello.
How about setting the RDS Aurora security group's inbound rules to only allow the EC2 security group?
If you set up a security group using the steps in the document below, only AWS resources with a specific security group can connect to RDS Aurora.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/tutorial-ec2-rds-option3.html#option3-task3-connect-rds-database-to-ec2-instance
