Binary file used by .NET to compile JavaScript code to .exe or .dll format
jsc.exe /t:library Library.js
Use jsc.exe to compile JavaScript code stored in Library.js and output Library.dll.
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)