Generating a Stageless .NET Assembly

Generating a Stageless .NET Assembly

It's possible to generate stageless payloads although as of writing the process is not automated and a little tedious.

• Download ILMerge & the latest Boolang release to a Windows box

• Open stage.boo in any text editor

• Open the desired C2 channel from the teamserver/comms directory in any text editor

• Replace line 63 in the stage.boo file with the previously opened C2 Channel

• Compile stage.boo using the Boo Compiler with the following command (depending on the selected C2 Channel you might have to add more assembly references to the -r parameter):

  • booc.exe -r:System.Web.Extensions stage.boo

• Create a new executable with ILMerge so the resulting assembly will have the Boolang Dlls necessary for it to run with the following command:

ILMerge.exe /out:stageless.exe /v4 stage.exe Boo.Lang.dll Boo.Lang.Compiler.dll Boo.Lang.Extensions.dll Boo.Lang.Parser.dll