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37 lines
2.0 KiB
YAML
37 lines
2.0 KiB
YAML
---
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Name: Csc.exe
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Description: Binary file used by .NET to compile C# code
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Author: 'Oddvar Moe'
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Created: 2018-05-25
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Commands:
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- Command: csc.exe -out:My.exe File.cs
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Description: Use CSC.EXE to compile C# code stored in File.cs and output the compiled version to My.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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- Command: csc -target:library File.cs
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Description: Use CSC.EXE to compile C# code stored in File.cs and output the compiled version to a dll file.
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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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Full_Path:
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- Path: C:\Windows\Microsoft.NET\Framework\v4.0.30319\Csc.exe
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- Path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Csc.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/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_csc_susp_parent.yml
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- Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_csc_susp_folder.yml
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- Elastic: https://github.com/elastic/detection-rules/blob/61afb1c1c0c3f50637b1bb194f3e6fb09f476e50/rules/windows/defense_evasion_dotnet_compiler_parent_process.toml
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- Elastic: https://github.com/elastic/detection-rules/blob/82ec6ac1eeb62a1383792719a1943b551264ed16/rules/windows/defense_evasion_execution_msbuild_started_unusal_process.toml
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- IOC: Csc.exe should normally not run as System account unless it is used for development.
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Resources:
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- Link: https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/compiler-options/command-line-building-with-csc-exe
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Acknowledgement:
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- Person:
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Handle:
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