From kitploit.com
Xencrypt is a PowerShell crypter that uses AES encryption and Gzip/DEFLATE compression to with every invocation generate a completely unique yet functionally equivalent output script given any input script. It does this by compressing and encrypting the input script and storing this data as a payload in a new script which will unencrypt and decompress the payload before running it. In essence, it is to PowerShell what a PE crypter is.