The world of antivirus software moves very quickly, even by Internet standards. As of this writing, the methods and processes documented in this chapter work successfully; however, experience has shown that even a few months can bring major changes in how antivirus evasion is accomplished. Although the Metasploit team is constantly tweaking its payloads and attempts to stay one step ahead of detection algorithms, don’t be surprised if by the time you work through these examples, some work and some do not. When you’re attempting antivirus evasion, consider using multiple packers or encoders, as mentioned, or write your own. Antivirus evasion, like all penetration testing skills, needs to be practiced and requires dedicated research to help you ensure success in your engagements.