Binary file used by .NET to compile JavaScript code to .exe or .dll format
jsc.exe scriptfile.js
Use jsc.exe to compile JavaScript code stored in scriptfile.js and output scriptfile.exe.
Compile attacker code on system. Bypass defensive counter measures.
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Jsc.exe, C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Jsc.exe, C:\Windows\Microsoft.NET\Framework\v2.0.50727\Jsc.exe, C:\Windows\Microsoft.NET\Framework64\v2.0.50727\Jsc.exe
Sigma: https://github.com/SigmaHQ/sigma/blob/35a7244c62820fbc5a832e50b1e224ac3a1935da/rules/windows/process_creation/proc_creation_win_lolbin_jsc.yml, IOC: Jsc.exe should normally not run a system unless it is used for development.
Malwrologist (@DissectMalware)