Security researchers from both Symantec and Trend Micro have come across new and sophisticated threats that use Windows PowerShell. A newly identified malicious malicious. script injects malicious code into ‘rundll32.exe’ to hide itself in the computer while still running and acting like a back door. The script compiles and executes malicious code embedded into it on the fly to make detection harder, researchers say. A similar threat is known as CRIGENT, a self-propagating computer worm.”]