.. /Aspnet_Compiler.exe

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ASP.NET Compilation Tool

• https://ijustwannared.team/2020/08/01/the-curious-case-of-aspnet_compiler-exe/
• https://docs.microsoft.com/en-us/dotnet/api/system.web.compilation.buildprovider.generatecode?view=netframework-4.8

AWL bypass

1. Execute C# code with the Build Provider and proper folder structure in place.

   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

   Use case

   Execute proxied payload with Microsoft signed binary to bypass application control solutions

   Privileges required

   User

   Operating systems

   Windows 10, Windows 11

   ATT&CK® technique

   T1127