Pivotnacci - A tool to make socks connections through HTTP agents

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Pivot into the internal network by deploying HTTP agents. Pivotnacci allows you to create a socks server which communicates with HTTP agents. The architecture looks like the following:

This tool was inspired by the great reGeorg. However, it includes some improvements:

  • Support for balanced servers
  • Customizable polling interval, useful to reduce detection rates
  • Auto drop connections closed by a server
  • Modular and cleaner code
  • Installation through pip
  • Password-protected agents

Supported socks protocols

  • Socks 4
  • Socks 5
    • No authentication
    • User password
    • GSSAPI

Installation

From python packages:

pip3 install pivotnacci

From repository:

git clone https://github.com/blackarrowsec/pivotnacci.git
cd pivotnacci/
pip3 install -r requirements.txt # to avoid installing on the OS
python3 setup.py install # to install on the OS

Usage

  1. Upload the required agent (php, jsp or aspx) to a webserver
  2. Start the socks server once the agent is deployed
  3. Configure proxychains or any other proxy client (the default listening port for pivotnacci socks server is 1080)
$ pivotnacci -h
usage: pivotnacci [-h] [-s addr] [-p port] [--verbose] [--ack-message message]
                  [--password password] [--user-agent user_agent]
                  [--header header] [--proxy [protocol://]host[:port]]
                  [--type type] [--polling-interval milliseconds]
                  [--request-tries number] [--retry-interval milliseconds]
                  url

Socks server for HTTP agents

positional arguments:
  url                   The url of the agent

optional arguments:
  -h, --help            show this help message and exit
  -s addr, --source addr
                        The default listening address (default: 127.0.0.1)
  -p port, --port port  The default listening port (default: 1080)
  --verbose, -v
  --ack-message message, -a message
                        Message returned by the agent web page (default:
                        Server Error 500 (Internal Error))
  --password password   Password to communicate with the agent (default: )
  --user-agent user_agent, -A user_agent
                        The User-Agent header sent to the agent (default:
                        pivotnacci/0.0.1)
  --header header, -H header
                        Send custom header. Specify in the form 'Name: Value'
                        (default: None)
  --proxy [protocol://]host[:port], -x [protocol://]host[:port]
                        Set the HTTP proxy to use.(Environment variables
                        HTTP_PROXY and HTTPS_PROXY are also supported)
                        (default: None)
  --type type, -t type  To specify agent type in case is not automatically
                        detected. Options are ['php', 'jsp', 'aspx'] (default:
                        None)
  --polling-interval milliseconds
                        Interval to poll the agents (for recv operations)
                        (default: 100)
  --request-tries number
                        The number of retries for each request to an agent. To
                        use in case of balanced servers (default: 50)
  --retry-interval milliseconds
                        Interval to retry a failure request (due a balanced
                        server) (default: 100)

Examples

Using an agent with a password s3cr3t (AGENT_PASSWORD the variable must be modified at the agent side as well):

pivotnacci  https://domain.com/agent.php --password "s3cr3t"

Using a custom HTTP Host header and a custom CustomAgent User-Agent:

pivotnacci  https://domain.com/agent.jsp -H 'Host: vhost.domain.com' -A 'CustomAgent'

Setting a different agent message 418 I'm a teapot (ACK_MESSAGE variable must be modified at the agent side as well):

pivotnacci https://domain.com/agent.aspx --ack-message "418 I'm a teapot"

Reduce detection rate (e.g. WAF) by setting the polling interval to 2 seconds:

pivotnacci  https://domain.com/agent.php --polling-interval 2000

Author

Eloy Pérez (@Zer1t0) [ www.blackarrow.net - www.tarlogic.com ]


May 28, 2020

Author

Hakin9 TEAM
Hakin9 is a monthly magazine dedicated to hacking and cybersecurity. In every edition, we try to focus on different approaches to show various techniques - defensive and offensive. This knowledge will help you understand how most popular attacks are performed and how to protect your data from them. Our tutorials, case studies and online courses will prepare you for the upcoming, potential threats in the cyber security world. We collaborate with many individuals and universities and public institutions, but also with companies such as Xento Systems, CATO Networks, EY, CIPHER Intelligence LAB, redBorder, TSG, and others.
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