The file
Code:
C:\Users\<Username>\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Whalebird.lnk
is in fact detected as TangoDialer.

It's described as an Autostart file in the Dialer-001 category, having rule ID CE8E2812 and a rather high level of danger.

Whalebird is an Electron based Mastodon, Pleroma and Misskey client. It's multiplatform and open source (source code is available on the project's github page h3poteto/whalebird-desktop).

I don't understand why only the shortcut on the start menu is detected as malware, by the way I have tried to recreate the shortcut myself, but it is still detected. At the moment I've seen fit to ignore the item because in my opinion it may be a false positive.