Malware
X-Tunnel (.NET)
This is a rewrite of win.xtunnel using the .NET framework that surfaced late 2017.
X-Tunnel (.NET) is a Windows malware family operated by APT28.
Background
Appearing in late 2017, this variant is a reimplementation of win.xtunnel built on the .NET framework.
Source: Malpedia (Fraunhofer FKIE).