LOLBAS/yml/OSBinaries/Jsc.yml

37 lines
1.6 KiB
YAML

---
Name: Jsc.exe
Description: Binary file used by .NET to compile JavaScript code to .exe or .dll format
Author: 'Oddvar Moe'
Created: 2019-05-31
Commands:
- Command: jsc.exe scriptfile.js
Description: Use jsc.exe to compile JavaScript code stored in scriptfile.js and output scriptfile.exe.
Usecase: Compile attacker code on system. Bypass defensive counter measures.
Category: Compile
Privileges: User
MitreID: T1127
OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11
- Command: jsc.exe /t:library Library.js
Description: Use jsc.exe to compile JavaScript code stored in Library.js and output Library.dll.
Usecase: Compile attacker code on system. Bypass defensive counter measures.
Category: Compile
Privileges: User
MitreID: T1127
OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11
Full_Path:
- Path: C:\Windows\Microsoft.NET\Framework\v4.0.30319\Jsc.exe
- Path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Jsc.exe
- Path: C:\Windows\Microsoft.NET\Framework\v2.0.50727\Jsc.exe
- Path: C:\Windows\Microsoft.NET\Framework64\v2.0.50727\Jsc.exe
Code_Sample:
- Code:
Detection:
- 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.
Resources:
- Link: https://twitter.com/DissectMalware/status/998797808907046913
- Link: https://www.phpied.com/make-your-javascript-a-windows-exe/
Acknowledgement:
- Person: Malwrologist
Handle: '@DissectMalware'