I failed to submit a report via http://www.immunet.com/false_positive, so I report here.
OS: Windows 10 Home ver.1909 Korean
Immunet ver: 7.0.2.11454
Name of file causing FP: SimulatorSetup.exe
Sha256 of file causing FP: 121e868268ab84f9d9ab83af3f107ed57dfa8e2a5695c307a0db1de9f191a5d2
Size of file causing FP:17.2MB
Alert name: Win.Dropper.Generic::mash.rt.sbx.vioc
This file is for installing RanSim made by KnowBe4, Inc. This program is a ransomware simulator.
RanCERT(https://www.rancert.com/) providing by innotium.inc(https://www.innotium.com/) introduce Koreans to this program. So, I think the program is safe.