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28 lines
1.4 KiB
YAML
28 lines
1.4 KiB
YAML
---
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Name: Aspnet_Compiler.exe
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Description: ASP.NET Compilation Tool
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Author: Jimmy (@bohops)
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Created: 2021-09-26
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Commands:
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- Command: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet_compiler.exe -v none -p C:\users\cpl.internal\desktop\asptest\ -f C:\users\cpl.internal\desktop\asptest\none -u
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Description: Execute C# code with the Build Provider and proper folder structure in place.
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Usecase: Execute proxied payload with Microsoft signed binary to bypass application control solutions
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Category: AWL Bypass
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Privileges: User
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MitreID: T1127
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OperatingSystem: Windows 10, Windows 11
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Full_Path:
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- Path: c:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
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- Path: c:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet_compiler.exe
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Code_Sample:
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- Code: https://github.com/ThunderGunExpress/BringYourOwnBuilder
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Detection:
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- BlockRule: https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-application-control/microsoft-recommended-block-rules
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- Sigma: https://github.com/SigmaHQ/sigma/blob/62d4fd26b05f4d81973e7c8e80d7c1a0c6a29d0e/rules/windows/process_creation/proc_creation_win_lolbin_aspnet_compiler.yml
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Resources:
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- Link: https://ijustwannared.team/2020/08/01/the-curious-case-of-aspnet_compiler-exe/
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- Link: https://docs.microsoft.com/en-us/dotnet/api/system.web.compilation.buildprovider.generatecode?view=netframework-4.8
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Acknowledgement:
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- Person: cpl
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Handle: '@cpl3h'
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