AWS EC2 instance credential exfiltrated

Classification:

threat-intel

Set up the guardduty integration.

Overview

Goal

Detect when an AWS API call is made from a non EC2 IP for a credential which is scoped to an EC2 Instance.

Strategy

This rule lets you monitor this GuardDuty integration finding:

• UnauthorizedAccess:IAMUser/InstanceCredentialExfiltration

Triage & Response

1. Determine the EC2 instance this credential is scoped to. This can be found in the samples.
2. Determine if the EC2 instance credentials are compromised.
3. If the instance is compromised:
   • Review the AWS documentation on remediating a compromised EC2 instance.