The main idea of FwAnalyzer is to provide a tool for rapid analysis of filesystem images as part of a firmware security Q&A check suite. FwAnalyzer takes a configuration file that defines various rules for files and directories and runs the configured checks against a given filesystem image. The output of FwAnalyzer is a report, which contains the list of files that violate any of the rules specified in the configuration. The report further contains meta information about the filesystem image and, if configured, information extracted from files within the analyzed filesystem. The report is formatted using JSON so it can be easily integrated as a step in a larger analysis.