Malware
POWERPLANT
This powershell code is a PowerShell written backdoor used by FIN7.
POWERPLANT is a PowerShell malware family operated by FIN7.
Background
POWERPLANT is a backdoor coded in PowerShell and employed by FIN7. According to Mandiant, it turned out to be a "vast backdoor framework with a breadth of capabilities, depending on which modules are delivered from the C2 server."
Source: Malpedia (Fraunhofer FKIE).