Installing netcat backdoors with a piZero

I have been playing with my stack of piZero’s recently and started to read about the kernel OTG gadgets and was intrigued by the OTG_HID gadget.  So after doing some reading I found that someone had ported the USB Rubber Ducky platform to the piZero and called it rspiducky.
Building it is fairly straight forward but if you if you want a ready made solution I put a precompiled copy of the .img file here.
Once you get the image to your SD card (sudo dd if=duckberrypi_zero_minibian_05.img of=/dev/disk*/ bs=4m) you then start putting your payload into (surprise) payload.dd.
It is amazingly easy to drop a NetCat backdoor using this method.  You just need a publically available server you can run nc -l -p 443 -vvv on. 
Here is a non-persistent example:
https://gist.github.com/jgamblin/348254c8d3e9b94f9214e9ad5473a44e
Here is a persistent example via a cron job:
https://gist.github.com/jgamblin/158ea8a5c2459e74541f89ca728e66a0
Here is the script running:

Here is what the NC backdoor looks like:

Bonus Scripts:

Type the longest word in the world 100,000 times:
https://gist.github.com/jgamblin/c18c5818c6055cb9bb7394787cf8f9a5

Hide all windows 100,000 times:
https://gist.github.com/jgamblin/f2762d9da59c07a273a2028379052cc2
Hello World test script:
https://gist.github.com/jgamblin/0c2ca413b90e72c1e3fa1f9f53dc6fc6

As always have fun and only do good with these tools. 

Spoofing Beacon Frames From The 5000 Most Common SSIDS

I have been reading a lot about Beacon Frames on my vacation this week (stop laughing) and I came across a tool in Kali called MDK3 that will allow you to send fake beacon frames.  I couldnt pass up a chance to test this so I pulled out my trusty TL-WN722N and made a list of the 5,0000 most common SSIDS from wiggle.net.
Here are the commands to run it assuming your wireless interface is WLAN0:
Grab the commonssids.txt from my gist:
wget https://gist.githubusercontent.com/jgamblin/da795e571fb5f91f9e86a27f2c2f626f/raw/0e5e53b97e372a21cb20513d5064fde11aed844c/commonssids.txt
Start airmon-ng:
airmon-ng start wlan0

Start MDK3 with the string:
mdk3 wlan0mon b -f commonssids.txt -g -t -m -s 1000

Here are the command flags: 
b - Beacon Flood Mode
f - Read SSIDs from file
g - Show station as 54 Mbit
t - Show station using WPA TKIP encryption
m - Use valid accesspoint MAC from OUI database
Here is what the output looks like:

Here is what the wireless list looks like on a host:

As always be careful using this anywhere that it could cause issues with other people’s internet access.  No one likes a jerk.

PiZero USB VPN SideCar

Thanks to PoisonTap I have finally had a reason to pull my PiZero out of the ever growing “Stuff to Hack” pile and start  working on it.   I have a couple of neat ideas that are coming down the pipeline but this weekend I built a VPN sidecar using a USB OTG Gadget. I wanted to be able to use the PiZero to offload some slow processes (big nmap scans) and as a place to verify findings through an always on VPN connection (I like and use Private Internet Access).
Configuration  is fairly simple and only takes about 30 minutes: 
Install your pizero as an ethernet gadget.
Share Your Internet Connection With Your PI:

You can now login into your PiZero at:
[email protected]

Update Your Pi and install OpenVPN:
sudo apt-get update && sudo apt-get -y dist-upgrade
sudo apt-get -y install openvpn
wget https://www.privateinternetaccess.com/openvpn/openvpn.zip
unzip openvpn.zip -d openvpn
sudo cp openvpn/ca.rsa.2048.crt openvpn/crl.rsa.2048.pem /etc/openvpn/
sudo cp "openvpn/US Texas.ovpn" "/etc/openvpn/Texas.conf"
#You can use a diffrent VPN endpoint if you like. Note the extension change from ovpn to conf.
sudo reboot

Create /etc/openvpn/login containing only your username and password, one per line, for example:
username
password123
Change the permissions on this file so only the root user can read it:
sudo chmod 600 /etc/openvpn/login
Setup OpenVPN to use your stored username and password by editing the the config file for the VPN endpoint:
sudo nano /etc/openvpn/Texas.conf
Change the following lines so they go from this:
auth-user-pass > auth-user-pass /etc/openvpn/login
crl-verify crl.rsa.2048.pem > crl-verify /etc/openvpn/crl.rsa.2048.pem
ca ca.rsa.2048.crt > ca /etc/openvpn/ca.rsa.2048.crt
Test VPN:
sudo openvpn --config /etc/openvpn/Texas.conf
If the VPN is working you will see:

Next step is to enable VPN at boot:
sudo systemctl enable openvpn@Texas
sudo reboot
After reboot verify VPN connection:

You now have an always on PiZero USB VPN SideCar! Have fun.   🙂

Automated Burp Suite Scanning and Reporting To Slack.

In the last two years Burp Suite Proxy has become my go to web application security scanner.  As with everything recently if I can automate it, I do.   So this weekend I built a simple script to scan a website with Burp, create a PDF report and post it to Slack:

Here is how I set it up:

https://gist.github.com/jgamblin/90c7aa1b369d1aa1e77b0af03216b9e1

  • Copy this line to your crontab to run this scan at 0100 on Mondays:
    00 01 * * 1 ./autoburp.sh
  • Enjoy weekly automated burp scanning and slack reporting of  your website.

Automated W3AF Scanning with Slack Alerting

I have recently been  automating a lot of my technical security tasks and building slack bots around them and it was w3af‘s turn.   W3af is an amazing open source web application security scanner that my friend Andres Riancho writes and maintains.
The goal of this project was to build scheduled and automated scans of my web properties with pdf reporting and slack alerting:
Configuration is fairly easy.

  • Create a SlackBot and copy API Key.
  • Update and install needed software on server:
    sudo apt-get update && sudo apt-get dist-upgrade
    sudo apt-get w3af
  • Install wkhtml2pdf in headless mode.
  • Create necessary folders:
    sudo mkdir /w3af
  • Copy this shell script and up token:

https://gist.github.com/jgamblin/ae1bdb24113788e70b91d0cc826a163f

  • Copy this w3af config file:

https://gist.github.com/jgamblin/2133162778e1d438f57114946b6244d6

  • Copy this line to your crontab to run this scan every night at midnight:
    00 00 * * * ./w3af/w3af.sh
  • Enjoy automated w3af scans with slack alerting.