do I have to react?
If yes how?
That depends on the source, say from where you have it
BitDefender will not show the whole thing for no reason… And since a Win32 / lodi entry is not necessarily harmless, I do not think it's a false alarm.
It also suggests that this is a ModPack that is conveniently an executable file.
Try it from another source.
To explain what this is about it. If I remember correctly, this is a Trojan, the u.a. A backdoor for remote connections by the hacker allows and of course also damages the PC.
The file comes to suspect before me because the Mod ISM (Instant Structures Mod)
as .jar file is available: https://instant-structures-mod.com/
Seems to be a virus.