AWS EC2 Instance Communicating Over Unusual Port

Classification:

anomaly

Set up the guardduty integration.

Overview

Goal

Detect when an EC2 instance is communicating over an unusual port.

Strategy

This rule lets you monitor this GuardDuty integration finding:

• Behavior:EC2/NetworkPortUnusual

Triage & Response

1. Determine which port triggered the signal. This can be found in the samples.
2. If the instance is compromised:
   • Review the AWS documentation on remediating a compromised EC2 instance.