A security expert has released a stripped-down Ubuntu distribution designed specifically for reverse-engineering malware. The OS, called REMnux, includes a slew of popular malware-analysis, network monitoring and memory forensics tools the comprise a very powerful environment for taking apart malicious code. REMNux is the creation of Lenny Zeltser, an expert on malware reverse engineering who teaches a popular course on the topic at SANS conferences. He originally used Red Hat Linux but recently decided that Ubuntu was a better fit.
Source: https://threatpost.com/new-linux-os-remnux-designed-reverse-engineering-malware-070910/74193/