Explains Zeltser on his blog, "REMnux is designed for running services that are useful to emulate within an isolated laboratory environment when performing behavioral malware analysis. As part of this process, the analyst typically infects another laboratory system with the malware sample and directs potentially-malicious connections to the REMnux system that's listening on the appropriate ports. REMnux is also useful for analyzing web-based malware, such as malicious JavaScript, Java programs, and Flash files."