wintun.dll
NetBird is an open-source WireGuard-based VPN and remote access platform that provides secure peer-to-peer connectivity. LOLRMM
Library on Windows LOLRMM NetBird
A file of NetBird
LOLRMM lists a file named wintun.dll as NetBird’s.
Its sitehttps://netbird.io/
From LOLRMM (Apache 2.0), which lists the remote management tools intruders are known to use as well as administrators. It goes by the file’s name.