Covenant: A Collaborative .NET C2 Framework for Red Teamers

Covenant is a .NET command and control framework that aims to highlight the attack surface of .NET, make the use of offensive .NET tradecraft easier, and serve as a collaborative command and control platform for red teamers.

Covenant is an ASP.NET Core, cross-platform application that includes a web-based interface that allows for multi-user collaboration.

Covenant Dashboard

Quick-Start Guide

Please see the Installation and Startup guide to get started with Covenant!

The Wiki documents most of Covenant's core features and how to use them.

Features

Covenant has several key features that make it useful and differentiate it from other command and control frameworks:

  • Intuitive Interface - Covenant provides an intuitive web application to easily run a collaborative red team operation.
  • Multi-Platform - Covenant targets .NET Core, which is multi-platform. This allows Covenant to run natively on Linux, MacOS, and Windows platforms. Additionally, Covenant has docker support, allowing it to run within a container on any system that has docker installed.
  • Multi-User - Covenant supports multi-user collaboration. The ability to collaborate has become crucial for effective red team operations. Many users can interact with the same Covenant server and operate independently or collaboratively.
  • API Driven - Covenant is driven by an API that enables multi-user collaboration and is easily extendible. Additionally, Covenant includes a Swagger UI that makes development and debugging easier and more convenient.
  • Listener Profiles - Covenant supports listener “profiles” that control how the network communication between Grunt implants and Covenant listeners look on the wire.
  • Encrypted Key Exchange - Covenant implements an encrypted key exchange between Grunt implants and Covenant listeners that is largely based on a similar exchange in the Empire project, in addition to optional SSL encryption. This achieves the cryptographic property of forward secrecy between Grunt implants.
  • Dynamic Compilation - Covenant uses the Roslyn API for dynamic C# compilation. Every time a new Grunt is generated or a new task is assigned, the relevant code is recompiled and obfuscated with ConfuserEx, avoiding totally static payloads. Covenant reuses much of the compilation code from the SharpGen project, which I described in much more detail in a previous post.
  • Inline C# Execution - Covenant borrows code and ideas from both the SharpGen and SharpShell projects to allow operators to execute C# one-liners on Grunt implants. This allows for similar functionality to that described in the SharpShell post, but allows the one-liners to be executed on remote implants.
  • Tracking Indicators - Covenant tracks “indicators” throughout an operation, and summarizes them in the Indicators menu. This allows an operator to conduct actions that are tracked throughout an operation and easily summarize those actions to the blue team during or at the end of an assessment for deconfliction and educational purposes. This feature is still in it’s infancy and still has room for improvement.
  • Developed in C# - Personally, I enjoy developing in C#, which may not be a surprise for anyone that has read my latest blogs or tools. Not everyone might agree that development in C# is ideal, but hopefully everyone agrees that it is nice to have all components of the framework written in the same language. I’ve found it very convenient to write the server, client, and implant all in the same language. This may not be a true “feature”, but hopefully it allows others to contribute to the project fairly easily.

Questions and Discussion

Have questions or want to chat more about Covenant? Join the #Covenant channel in the BloodHound Gang Slack.

Download Details:
Author: cobbr
Source Code: https://github.com/cobbr/Covenant
License: GPL-3.0 License

#dotnet  #aspdotnet  #csharp 

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Covenant: A Collaborative .NET C2 Framework for Red Teamers
Einar  Hintz

Einar Hintz

1602560783

jQuery Ajax CRUD in ASP.NET Core MVC with Modal Popup

In this article, we’ll discuss how to use jQuery Ajax for ASP.NET Core MVC CRUD Operations using Bootstrap Modal. With jQuery Ajax, we can make HTTP request to controller action methods without reloading the entire page, like a single page application.

To demonstrate CRUD operations – insert, update, delete and retrieve, the project will be dealing with details of a normal bank transaction. GitHub repository for this demo project : https://bit.ly/33KTJAu.

Sub-topics discussed :

  • Form design for insert and update operation.
  • Display forms in modal popup dialog.
  • Form post using jQuery Ajax.
  • Implement MVC CRUD operations with jQuery Ajax.
  • Loading spinner in .NET Core MVC.
  • Prevent direct access to MVC action method.

Create ASP.NET Core MVC Project

In Visual Studio 2019, Go to File > New > Project (Ctrl + Shift + N).

From new project window, Select Asp.Net Core Web Application_._

Image showing how to create ASP.NET Core Web API project in Visual Studio.

Once you provide the project name and location. Select Web Application(Model-View-Controller) and uncheck HTTPS Configuration. Above steps will create a brand new ASP.NET Core MVC project.

Showing project template selection for .NET Core MVC.

Setup a Database

Let’s create a database for this application using Entity Framework Core. For that we’ve to install corresponding NuGet Packages. Right click on project from solution explorer, select Manage NuGet Packages_,_ From browse tab, install following 3 packages.

Showing list of NuGet Packages for Entity Framework Core

Now let’s define DB model class file – /Models/TransactionModel.cs.

public class TransactionModel
{
    [Key]
    public int TransactionId { get; set; }

    [Column(TypeName ="nvarchar(12)")]
    [DisplayName("Account Number")]
    [Required(ErrorMessage ="This Field is required.")]
    [MaxLength(12,ErrorMessage ="Maximum 12 characters only")]
    public string AccountNumber { get; set; }

    [Column(TypeName ="nvarchar(100)")]
    [DisplayName("Beneficiary Name")]
    [Required(ErrorMessage = "This Field is required.")]
    public string BeneficiaryName { get; set; }

    [Column(TypeName ="nvarchar(100)")]
    [DisplayName("Bank Name")]
    [Required(ErrorMessage = "This Field is required.")]
    public string BankName { get; set; }

    [Column(TypeName ="nvarchar(11)")]
    [DisplayName("SWIFT Code")]
    [Required(ErrorMessage = "This Field is required.")]
    [MaxLength(11)]
    public string SWIFTCode { get; set; }

    [DisplayName("Amount")]
    [Required(ErrorMessage = "This Field is required.")]
    public int Amount { get; set; }

    [DisplayFormat(DataFormatString = "{0:MM/dd/yyyy}")]
    public DateTime Date { get; set; }
}

C#Copy

Here we’ve defined model properties for the transaction with proper validation. Now let’s define  DbContextclass for EF Core.

#asp.net core article #asp.net core #add loading spinner in asp.net core #asp.net core crud without reloading #asp.net core jquery ajax form #asp.net core modal dialog #asp.net core mvc crud using jquery ajax #asp.net core mvc with jquery and ajax #asp.net core popup window #bootstrap modal popup in asp.net core mvc. bootstrap modal popup in asp.net core #delete and viewall in asp.net core #jquery ajax - insert #jquery ajax form post #modal popup dialog in asp.net core #no direct access action method #update #validation in modal popup

Hertha  Mayer

Hertha Mayer

1602668764

Announcing Entity Framework Core (EF Core) 5 RC2

Today, the Entity Framework Core team announces the second release candidate (RC2) of EF Core 5.0. This is a feature complete release candidate of EF Core 5.0 and ships with a “go live” license. You are supported using it in production. This is a great opportunity to start using EF Core 5.0 early while there is still time to fix remaining issues. We’re looking for reports of any remaining critical bugs that should be fixed before the final release.

Prerequisites

EF Core 5.0 will not run on .NET Standard 2.0 platforms, including .NET Framework.

How to get EF Core 5.0 Release Candidate 2

EF Core is distributed exclusively as a set of NuGet packages. For example, to add the SQL Server provider to your project, you can use the following command using the dotnet tool:

dotnet add package Microsoft.EntityFrameworkCore.SqlServer --version 5.0.0-rc.2.20475.6

#.net #.net core #.net framework #asp.net #c# #entity framework #announcement #asp.net core #entity framework core

Entity Framework 6 Extensions You Might Be Unaware Of

Entity Framework 6 was and still remains a ‘workhorse’ for data access in corporate .NET-based applications primarily because of its stability, low barrier of entry, and wide renown. Therefore, I hope this article will still be useful.

Contents

  1. Database First without EDMX
  2. Working with detached graphs
  3. SQL modification
  4. Data caching beyond the boundaries of the DbContext life-cycle
  5. Retry during errors from SQL Server
  6. Overriding DbContext, isolating from the real DB
  7. Quick insert

#.net #.net framework #ado.net #entity framework #entity framework 6 extensions you might be unaware of – {coding}sight

Deion  Hilpert

Deion Hilpert

1597289793

.NET Framework August 2020 Security and Quality Rollup Updates

Today, we are releasing the August 2020 Security and Quality Rollup Updates for .NET Framework. Security CVE-2020-1476– .NET Framework Elevation of Privilege Vulnerability An elevation of privilege vulnerability exists when ASP.NET or .NET Framework web applications running on IIS improperly allow access to cached files.

#.net #.net framework #asp.net #dot.net #security

Covenant: A Collaborative .NET C2 Framework for Red Teamers

Covenant is a .NET command and control framework that aims to highlight the attack surface of .NET, make the use of offensive .NET tradecraft easier, and serve as a collaborative command and control platform for red teamers.

Covenant is an ASP.NET Core, cross-platform application that includes a web-based interface that allows for multi-user collaboration.

Covenant Dashboard

Quick-Start Guide

Please see the Installation and Startup guide to get started with Covenant!

The Wiki documents most of Covenant's core features and how to use them.

Features

Covenant has several key features that make it useful and differentiate it from other command and control frameworks:

  • Intuitive Interface - Covenant provides an intuitive web application to easily run a collaborative red team operation.
  • Multi-Platform - Covenant targets .NET Core, which is multi-platform. This allows Covenant to run natively on Linux, MacOS, and Windows platforms. Additionally, Covenant has docker support, allowing it to run within a container on any system that has docker installed.
  • Multi-User - Covenant supports multi-user collaboration. The ability to collaborate has become crucial for effective red team operations. Many users can interact with the same Covenant server and operate independently or collaboratively.
  • API Driven - Covenant is driven by an API that enables multi-user collaboration and is easily extendible. Additionally, Covenant includes a Swagger UI that makes development and debugging easier and more convenient.
  • Listener Profiles - Covenant supports listener “profiles” that control how the network communication between Grunt implants and Covenant listeners look on the wire.
  • Encrypted Key Exchange - Covenant implements an encrypted key exchange between Grunt implants and Covenant listeners that is largely based on a similar exchange in the Empire project, in addition to optional SSL encryption. This achieves the cryptographic property of forward secrecy between Grunt implants.
  • Dynamic Compilation - Covenant uses the Roslyn API for dynamic C# compilation. Every time a new Grunt is generated or a new task is assigned, the relevant code is recompiled and obfuscated with ConfuserEx, avoiding totally static payloads. Covenant reuses much of the compilation code from the SharpGen project, which I described in much more detail in a previous post.
  • Inline C# Execution - Covenant borrows code and ideas from both the SharpGen and SharpShell projects to allow operators to execute C# one-liners on Grunt implants. This allows for similar functionality to that described in the SharpShell post, but allows the one-liners to be executed on remote implants.
  • Tracking Indicators - Covenant tracks “indicators” throughout an operation, and summarizes them in the Indicators menu. This allows an operator to conduct actions that are tracked throughout an operation and easily summarize those actions to the blue team during or at the end of an assessment for deconfliction and educational purposes. This feature is still in it’s infancy and still has room for improvement.
  • Developed in C# - Personally, I enjoy developing in C#, which may not be a surprise for anyone that has read my latest blogs or tools. Not everyone might agree that development in C# is ideal, but hopefully everyone agrees that it is nice to have all components of the framework written in the same language. I’ve found it very convenient to write the server, client, and implant all in the same language. This may not be a true “feature”, but hopefully it allows others to contribute to the project fairly easily.

Questions and Discussion

Have questions or want to chat more about Covenant? Join the #Covenant channel in the BloodHound Gang Slack.

Download Details:
Author: cobbr
Source Code: https://github.com/cobbr/Covenant
License: GPL-3.0 License

#dotnet  #aspdotnet  #csharp