Cloud infrastructure security and configuration has been shown to be a difficult task to master. Sysadmins and developers with years of traditional IT experience are now being pushed to the cloud, where there is a whole new set of rules. This is what makes AWS environments particularly exciting to attack as a penetration tester. Best practices are often overlooked or ignored, which can leave gaps throughout an AWS environment that are ripe for exploitation. With an increasing number of breaches leaking AWS secret keys, companies are working to be proactive and are looking for red-team-like post exploitation penetration tests, so that they can be sure that their client data is as safe as possible post-breach.Due to this need and the lack of AWS specific attack tools, I wrote Pacu, an open source Amazon Web Services post exploitation attack tool created and used for Rhino Security Labs pentests.In this talk I will cover how red teamers can use Pacu to simulate real-world attack scenarios against AWS environments, starting from IAM enumeration and scanning through exploitation, privilege escalation, data exfiltration and even providing reporting documentation.