Securitain

Introduction

In today's fast-evolving cloud landscape, security isn't just an enterprise issue. Small and midsize businesses (SMBs) increasingly rely on AWS infrastructure to store data, host applications, and serve customers globally. Unfortunately, attackers know this too — making SMBs a growing target for credential theft, ransomware, and insider misuse.

AWS GuardDuty offers an intelligent, automated way to detect and respond to these threats. In this 2025 guide, we'll explore how GuardDuty works, what's new this year, and how Securitain helps SMBs make the most of it.

What is AWS GuardDuty?

GuardDuty is AWS's managed threat detection service. It continuously monitors AWS accounts, EC2 instances, and S3 buckets for suspicious activity using AI, threat intelligence feeds, and anomaly detection.

Unlike traditional SIEM systems, GuardDuty is agentless and fully managed, which means SMBs can deploy it across all AWS accounts in minutes — no servers to manage or data pipelines to maintain.

New in 2025

AWS has expanded GuardDuty coverage with:

EKS runtime threat detection for container workloads
RDS protection against anomalous query behaviors
S3 malware scanning for uploaded objects

These enhancements bring enterprise-grade visibility to SMBs at a fraction of traditional cost.

Best Practices for SMBs

1. Enable GuardDuty Across All Accounts

Enable GuardDuty across all AWS accounts via Organizations to ensure comprehensive coverage.

2. Integrate with AWS Security Hub

Integrate with AWS Security Hub for centralized visibility across all your security findings.

3. Automate Response Actions

Automate responses using EventBridge and Lambda (e.g., isolate EC2 instances when threats are detected).

4. Regular Review and Optimization

Regularly review findings to improve IAM and network policies, reducing false positives over time.

How Securitain Enhances GuardDuty

Securitain aggregates GuardDuty findings across accounts and regions, correlates them with Security Hub posture data, and converts them into actionable insights.

You can monitor trends, assign remediations, and export compliance evidence directly from your dashboard — all read-only, zero risk to your workloads.