OfensivePipeline allows you to download and build C# tools, applying certain modifications in order to improve their evasion for Red Team exercises.
A common use of OffensivePipeline is to download a tool from a Git repository, randomise certain values in the project, build it, obfuscate the resulting binary and generate a shellcode.
OffensivePipeline.exe list
OffensivePipeline.exe all
OffensivePipeline.exe t toolName
OffensivePipeline.exe
PS C:\OffensivePipeline> .\OffensivePipeline.exe t rubeus
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\___/|_| |_| \___|_| |_|___/_| \_/ \___|_| |_| .__/ \___|_|_|_| |_|\___| oo oo
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@aetsu
v2.0.0
[+] Loading tool: Rubeus
Clonnig repository: Rubeus into C:\OffensivePipeline\Git\Rubeus
Repository Rubeus cloned into C:\OffensivePipeline\Git\Rubeus
[+] Load RandomGuid module
Searching GUIDs...
> C:\OffensivePipeline\Git\Rubeus\Rubeus.sln
> C:\OffensivePipeline\Git\Rubeus\Rubeus\Rubeus.csproj
> C:\OffensivePipeline\Git\Rubeus\Rubeus\Properties\AssemblyInfo.cs
Replacing GUIDs...
File C:\OffensivePipeline\Git\Rubeus\Rubeus.sln:
> Replacing GUID 658C8B7F-3664-4A95-9572-A3E5871DFC06 with 3bd82351-ac9a-4403-b1e7-9660e698d286
> Replacing GUID FAE04EC0-301F-11D3-BF4B-00C04F79EFBC with 619876c2-5a8b-4c48-93c3-f87ca520ac5e
> Replacing GUID 658c8b7f-3664-4a95-9572-a3e5871dfc06 with 11e0084e-937f-46d7-83b5-38a496bf278a
[+] No errors!
File C:\OffensivePipeline\Git\Rubeus\Rubeus\Rubeus.csproj:
> Replacing GUID 658C8B7F-3664-4A95-9572-A3E5871DFC06 with 3bd82351-ac9a-4403-b1e7-9660e698d286
> Replacing GUID FAE04EC0-301F-11D3-BF4B-00C04F79EFBC with 619876c2-5a8b-4c48-93c3-f87ca520ac5e
> Replacing GUID 658c8b7f-3664-4a95-9572-a3e5871dfc06 with 11e0084e-937f-46d7-83b5-38a496bf278a
[+] No errors!
File C:\OffensivePipeline\Git\Rubeus\Rubeus\Properties\AssemblyInfo.cs:
> Replacing GUID 658C8B7F-3664-4A95-9572-A3E5871DFC06 with 3bd82351-ac9a-4403-b1e7-9660e698d286
> Replacing GUID FAE04EC0-301F-11D3-BF4B-00C04F79EFBC with 619876c2-5a8b-4c48-93c3-f87ca520ac5e
> Replacing GUID 658c8b7f-3664-4a95-9572-a3e5871dfc06 with 11e0084e-937f-46d7-83b5-38a496bf278a
[+] No errors!
[+] Load RandomAssemblyInfo module
Replacing strings in C:\OffensivePipeline\Git\Rubeus\Rubeus\Properties\AssemblyInfo.cs
[assembly: AssemblyTitle("Rubeus")] -> [assembly: AssemblyTitle("g4ef3fvphre")]
[assembly: AssemblyDescription("")] -> [assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")] -> [assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")] -> [assembly: AssemblyCompany("")]
[assembly: AssemblyProduc t("Rubeus")] -> [assembly: AssemblyProduct("g4ef3fvphre")]
[assembly: AssemblyCopyright("Copyright ยฉ 2018")] -> [assembly: AssemblyCopyright("Copyright ยฉ 2018")]
[assembly: AssemblyTrademark("")] -> [assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")] -> [assembly: AssemblyCulture("")]
[+] Load BuildCsharp module
[+] Checking requirements...
[*] Downloading nuget.exe from https://dist.nuget.org/win-x86-commandline/latest/nuget.exe
[+] Download OK - nuget.exe
[+] Path found - C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\Common7\Tools\VsDevCmd.bat
Solving dependences with nuget...
Building solution...
[+] No errors!
[+] Output folder: C:\OffensivePipeline\Output\Rubeus_vh00nc50xud
[+] Load ConfuserEx module
[+] Checking requirements...
[+] Downloading ConfuserEx from https://github.com/mkaring/ConfuserEx/releases/download/v1.6.0/ConfuserEx-CLI.zip
[+] Download OK - ConfuserEx
Confusing...
[+] No errors!
[+] Load Donut module
Generating shellcode...
Payload options:
Domain: RMM6XFC3
Runtime:v4.0.30319
Raw Payload: C:\OffensivePipeline\Output\Rubeus_vh00nc50xud\ConfuserEx\Donut\Rubeus.bin
B64 Payload: C:\OffensivePipeline\Output\Rubeus_vh00nc50xud\ConfuserEx\Donut\Rubeus.bin.b64
[+] No errors!
[+] Generating Sha256 hashes
Output file: C:\OffensivePipeline\Output\Rubeus_vh00nc50xud
-----------------------------------------------------------------
SUMMARY
- Rubeus
- RandomGuid: OK
- RandomAssemblyInfo: OK
- BuildCsharp: OK
- ConfuserEx: OK
- Donut: OK
-----------------------------------------------------------------
The scripts for downloading the tools are in the Tools folder in yml format. New tools can be added by creating new yml files with the following format:
tool:
- name: Rubeus
description: Rubeus is a C# toolset for raw Kerberos interaction and abuses
gitLink: https://github.com/GhostPack/Rubeus
solutionPath: Rubeus\Rubeus.sln
language: c#
plugins: RandomGuid, RandomAssemblyInfo, BuildCsharp, ConfuserEx, Donut
authUser:
authToken:
Where:
tool:
- name: SharpHound3-Custom
description: C# Rewrite of the BloodHound Ingestor
gitLink: https://github.com/aaaaaaa/SharpHound3-Custom
solutionPath: SharpHound3-Custom\SharpHound3.sln
language: c#
plugins: RandomGuid, RandomAssemblyInfo, BuildCsharp, ConfuserEx, Donut
authUser: aaaaaaa
authToken: abcdefghijklmnopqrsthtnf
Where:
tool:
- name: SeatbeltLocal
description: Seatbelt is a C# project that performs a number of security oriented host-survey "safety checks" relevant from both offensive and defensive security perspectives.
gitLink: C:\Users\alpha\Desktop\SeatbeltLocal
solutionPath: SeatbeltLocal\Seatbelt.sln
language: c#
plugins: RandomGuid, RandomAssemblyInfo, BuildCsharp, ConfuserEx, Donut
authUser:
authToken:
Where:
In the OffensivePipeline.dll.config file it's possible to change the version of the build tools used.
<add key="BuildCSharpTools" value="C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\Common7\Tools\VsDevCmd.bat"/>
<add key="BuildCSharpTools" value="C:\Program Files (x86)\Microsoft Visual Studio\2022\BuildTools\Common7\Tools\VsDevCmd.bat"/>
A .NET XOR encrypted cobalt strike aggressor implementation for chisel to utilize faster proxy and advanced socks5 capabilities.
In my experience I found socks4/socks4a proxies quite slow in comparison to its socks5 counterparts and a lack of implementation of socks5 in most C2 frameworks. There is a C# wrapper around the go version of chisel called SharpChisel. This wrapper has a few issues and isn't maintained to the latest version of chisel. It didnโt allow using shellcode with donut, reflectio n methods or execute-assembly
. I found a fix for this using the SharpChisel-NG project.
Since the SharpChisel assembly is around 16.7 MB
, execute-assembly
(has a hidden size limitation of 1 MB
) and similar in memory methods wouldnโt work. To maintain most of the execution in memory I incorporated the NetLoader project by Flangvik which is executed via execute-assembly
to reflectively host and load a XOR encrypted version of SharpChisel
with base64 arguments in memory.
As an alternative, it is also possible to implement similar C# proxies like SharpSocks by replacing the appropriate chisel binaries in the project.
Note: If using a Windows teamserver skip steps 2 and 3.
Clone/download the repository: git clone https://github.com/m3rcer/Chisel-Strike.git
Make all binaries executable:
cd Chisel-Strike
chmod +x -R chisel-modules
chmod +x -R tools
Mingw-w64
and mono
:sudo apt-get install mingw-w64
sudo apt install mono-complete
ChiselStrike.cna
in cobalt strike using the Script Manager
Recompile binaries from the src
folder if needed.
chisel can be executed on both the teamserver (windows/linux) and the beacon. With either acting as the server/client. A normal execution flow would be to setup a chisel server on the teamserver and create a client on the beacon connecting back to the teamserver.
chisel <client/server> <command>
: Run Chisel on a beacon
chisel-tms <client/server> <command>
: Run Chisel on your teamserver
chisel-enc
: XOR Encrypt SharpChisel.exe
with a password of choice
chisel-jobs
: List active chisel jobs on the teamserver and beacon
chisel-kill
: Kill active chisel jobs on a beacon
chisel-tms-kill
: Kill active chisel jobs on teamserver
NetLoader can easily be obfuscated and used to bypass defender using projects like NimCrypt2 and the like.
Yet SharpChisel.exe
drops a dll
on disk due to the use of Costura/Fody
packages at a location similar to: C:\Users\m3rcer\AppData\Local\Temp\Costura\CB9433C24E75EC539BF34CD1AA12B236\64\main.dll
which is detected by defender. It is advised to obfuscate chisel dll's using projects like gobfuscate in the SharpChisel-NG project and re-build new SharpChisel-NG binaries as shown here.
Figure a way to avoid SharpChisel
dropping main.dll
on disk / Create a new C# wrapper for chisel.
Create a method to parse command output for the chisel-tms
command.
shantanu561993 for the C# wrapper implementation of chisel: SharpChisel
latortuga71 for the load-assembly
fix: SharpChisel-NG