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Matthew Bryant (mandatory)
2020-04-26 14:48:59 -07:00
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# CursedChrome
<p align="center">
<img src="./images/icon.png" /><img src="./images/icon.png" /><img src="./images/icon.png" /><img src="./images/icon.png" /><img src="./images/icon.png" />
<img src="./images/doll.svg" height="128" width="128" /><img src="./images/doll.svg" height="128" width="128" /><img src="./images/doll.svg" height="128" width="128" /><img src="./images/doll.svg" height="128" width="128" /><img src="./images/doll.svg" height="128" width="128" />
</p>
## What is it?
# What is it?
A ([cursed](https://knowyourmeme.com/memes/cursed-image)) Chrome-extension implant that turns victim Chrome browsers into fully-functional HTTP proxies. By using the proxies this tool creates you can browse the web authenticated as your victim for all of their websites.
More and more companies are moving toward the ["BeyondCorp"](https://en.wikipedia.org/wiki/BeyondCorp) model (e.g. no flat internal network, zero trust everything). This is usually implemented via a [reverse proxy/OAuth wall](https://github.com/bitly/oauth2_proxy) gating access to services, eliminating the need for a VPN. With more and more access becoming strictly available via the web browser, having a way to easily hijack and use victim's web sessions becomes an ever increasing necessity.
# Why make it?
This is especially useful for locked down orgs that make use of [Chrome OS](https://en.wikipedia.org/wiki/Chrome_OS) where traditional malware can't be used at all. It's also steathy, as all requests will have the appropriate source-IP, cookies, client-certificates, etc since it's being proxying directly through the victim's browser.
More and more companies are moving toward the ["BeyondCorp"](https://en.wikipedia.org/wiki/BeyondCorp) model (e.g. no flat internal network, zero trust everything). This is usually implemented via a [reverse proxy/OAuth wall](https://github.com/bitly/oauth2_proxy) gating access to services, eliminating the need for a VPN. As access and tooling move towards being strictly available via the web browser, having a way to easily hijack and use victim's web sessions becomes an ever increasing necessity.
## Screenshots
This is also especially useful for locked down orgs that make use of [Chrome OS](https://en.wikipedia.org/wiki/Chrome_OS) where traditional malware can't be used at all. It's also steathy, as all requests will have the appropriate source-IP, cookies, client-certificates, etc since it's being proxying directly through the victim's browser.
### Web Admin Panel
# Screenshots
## Web Admin Panel
![](./images/cursed-chrome-web-panel.png)
### Browsing Websites Logged In as Victim (using Firefox with HTTP Proxy)
## Browsing Websites Logged In as Victim (using Firefox with HTTP Proxy)
![](./images/browsing-as-victim-browser.png)
## (Rough) Infrastructure Diagram (`docker-compose` Used)
# (Rough) Infrastructure Diagram (`docker-compose` Used)
![](./images/cursedchrome-diagram.png)
### Ports & Listening Interfaces
# Ports & Listening Interfaces
- `127.0.0.1:8080`: HTTP proxy server (using one of the credentials in the admin panel, you can auth to a specific victim's Chrome browser via this HTTP proxy server). You also need to install the generated CA available via the admin panel before using this.
- `127.0.0.1:4343`: Websocket server, used for communicating with victim Chrome instances to transfer HTTP requests for proxying and sending commands.
- `127.0.0.1:8118`: Admin web panel for viewing victim Chrome instances and getting HTTP proxy credentials.
## Requirements
# Requirements
* [`docker`](https://docs.docker.com/get-docker/) and [`docker-compose`](https://docs.docker.com/compose/install/)
* Chrome web browser
# Installation & Setup
## Setting Up the Backend
The backend is entirely dockerized and can be setup by running the following commands:
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After you've install the extension it will show up on the admin control panel at `http://localhost:8118`.
# Production/Operational Usage
## Modifying Implant Extension
An example implant extension has been included under the `extension/` folder. This extension has the `extension/src/bg/background.js` file which has the extension-side of the implant that connects to the service via WebSocket to proxy requests through the victim's web browser.
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These topics are outside of the scope of this README, but eventually will be covered separately.
## Notes on Production Deployments
## Further Notes on Production Deployments
* You will likely want to run an Nginx server with a valid HTTPS certificate doing a `proxy_pass` to the WebSocket server (running on `127.0.0.1:4343`). Then you'll have TLS-encrypted websocket traffic.
* For a more secure setup, don't expose the HTTP proxy & and admin panel to the Internet directly. Opt for SSL port-forwarding or using a bastion server to connect to it.
@@ -109,5 +115,5 @@ These topics are outside of the scope of this README, but eventually will be cov
## Attributions
* The icon used for the web panel favicon and the example Chrome implant extension is provided by Freepik from `www.flaticon.com`.
* The [AnyProxy source code](https://github.com/alibaba/anyproxy) was heavily modified and used for part of this project.
* The [AnyProxy source code](https://github.com/alibaba/anyproxy) was heavily modified and used for part of this project.
* The icon for this project was designed by [`monochromeye`](https://www.fiverr.com/monochromeye) on Fiverr (paid), if you're looking for graphic design work check her services out.
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