The landscape of malicious software, more commonly known as malware, grows every year in number, popularity and financial damage. Just like we see happening in the software industry, organizations in the cybercrime world are well coordinated: they hire developers, distributors, maintainers, they advertise their product, offering deployment services to paying customers and channels to signal bugs to fix. Manually examining every potentially malicious executable would be unfeasible to the least, therefore turning towards automated, fast analysis systems is becoming more and more a requirement to be efficient in the industry and offer meaningful results. To interfere with such automated techniques, malware developers will often hide meaningful routines activated only if certain conditions in the execution environment are met.