DARMSTADT, Germany--(BUSINESS WIRE)--Hackers and cyber criminals are using “sleeper” malware more and more to hide malicious code for mobile devices in apps. This “sleeper” malware does nothing initially. After a certain amount of time or predetermined action, though, it becomes active - making its recognition very difficult. Therefore, security researchers at the TU Darmstadt and Fraunhofer Institute for Secure Information Technology have developed the analysis tool Harvester, which helps secu