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* Adding various tags as a first iteration * Adding quotes * Adding 'Custom Format' properly * Updating to key:value pairs * Update template
41 lines
1.7 KiB
YAML
41 lines
1.7 KiB
YAML
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Name: Jsc.exe
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Description: Binary file used by .NET to compile JavaScript code to .exe or .dll format
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Author: 'Oddvar Moe'
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Created: 2019-05-31
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Commands:
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- Command: jsc.exe scriptfile.js
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Description: Use jsc.exe to compile JavaScript code stored in scriptfile.js and output scriptfile.exe.
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Usecase: Compile attacker code on system. Bypass defensive counter measures.
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Category: Compile
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Privileges: User
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MitreID: T1127
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OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11
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Tags:
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- Execute: WSH
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- Command: jsc.exe /t:library Library.js
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Description: Use jsc.exe to compile JavaScript code stored in Library.js and output Library.dll.
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Usecase: Compile attacker code on system. Bypass defensive counter measures.
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Category: Compile
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Privileges: User
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MitreID: T1127
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OperatingSystem: Windows vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11
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Tags:
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- Execute: WSH
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Full_Path:
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- Path: C:\Windows\Microsoft.NET\Framework\v4.0.30319\Jsc.exe
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- Path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Jsc.exe
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- Path: C:\Windows\Microsoft.NET\Framework\v2.0.50727\Jsc.exe
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- Path: C:\Windows\Microsoft.NET\Framework64\v2.0.50727\Jsc.exe
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Code_Sample:
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- Code:
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Detection:
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- Sigma: https://github.com/SigmaHQ/sigma/blob/35a7244c62820fbc5a832e50b1e224ac3a1935da/rules/windows/process_creation/proc_creation_win_lolbin_jsc.yml
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- IOC: Jsc.exe should normally not run a system unless it is used for development.
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Resources:
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- Link: https://twitter.com/DissectMalware/status/998797808907046913
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- Link: https://www.phpied.com/make-your-javascript-a-windows-exe/
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Acknowledgement:
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- Person: Malwrologist
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Handle: '@DissectMalware'
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