PowerShell is a full Windows administration framework, and it's built into the OS. It can't be completely blocked. When we talk about post-exploitation in Windows environments, consideration of PowerShell is not a nice-to-have; it's a necessity. We'll examine the post phase in more detail in the last two chapters of the book, but for now let's introduce PowerShell's role in bringing our attack to the next stage and one step closer to total compromise.