CloudBrute is a reconnaissance tool designed to discover cloud infrastructure, files, and applications belonging to target organizations across major cloud service providers. The tool operates in a black-box manner without requiring authentication credentials, making it suitable for external security assessments. It supports discovery across multiple cloud platforms including Amazon Web Services, Google Cloud Platform, Microsoft Azure, DigitalOcean, Alibaba Cloud, Vultr, and Linode. CloudBrute utilizes the IPINFO API for cloud detection and incorporates source code analysis capabilities. The tool features concurrent processing for improved performance and follows a modular architecture design. The tool outputs information about discovered cloud assets, infrastructure components, and hosted applications that can be used for security testing purposes. It addresses limitations of previous cloud reconnaissance approaches by providing comprehensive coverage across multiple cloud providers in a single tool.