Static security analysis of software has made great progress over the last years. In particular, this applies to the detection of lowlevel security bugs such as buffer overflows, Cross-Site Scripting and SQL injection vulnerabilities. Complementarily to commercial static code review tools, we present an approach to the static security analysis which is based upon the software architecture using a reverse engineering tool suite called Bauhaus. This allows one to analyze software on a more abstract level, and a more focused analysis is possible, concentrating on software modules regarded as security-critical. In addition, certain security flaws can be detected at the architectural level such as the circumvention of APIs or incomplete enforcement of access control. We discuss our approach in the context of a business application and Android’s Java-based middleware.