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AWS EC2 instance Sending spam emails

guardduty

Classification:

attack

Tactic:

Technique:

Goal

Detect when an EC2 instance is compromised and sending spam emails.

Strategy

This rule lets you monitor this GuardDuty integration finding:

Triage and response

  1. Determine if the EC2 should be sending out email over port 25.
  2. If the instance is compromised:
    • Review the AWS documentation on remediating a compromised EC2 instance.

Changelog

  • 1 November 2022 - Updated links.