Hak5 Shark Jack

Information

Name	Shark Jack network attack tool
Manufacturer	Hak5
Link	https://lab401.com/products/shark-jack
Specification	https://docs.hak5.org/shark-jack/
Technologies	Ethernet, USB
Included equipment	1x shark jack, 1x instruction card

Description

Portable network attack tool, fast nmap scans. The Shark-Jack is a pen-testing utility developed by the ”Hak5” company and is designed for Ethernet plug and play vulnerability scanning in LANs. In its most basic form, it is essentially a small Linux-machine with a built-in Ethernet plug. The modest, portable physical nature of the device allows for quick and secretive reconnaissance activity. The Shark-Jack consists of following physical components: USB-C charging port, Battery, Status LED, RJ45 Ethernet Jack, MT7628DAN Mikrocontroller, 64 MB RAM, Casing with mode-switch.

Operation

It provides 3 modes of operation: Off, Arming, and Attack. In attack mode, the Shark Jack will execute the payload.sh or payload.txt bash script from the /root/payload directory. In arming mode, the Shark Jack will be configured with a static IP address of 172.16.24.1 and will simply start an SSH server, without automatically executing any script. In this mode, a perpetrator may load and configure scripts, or retrieve output files placed in the loot directory from previous reconnaissance or attack operations. This can be done using the Linux command line utility “scp”. The status LED lights are configurable using appropriate syntax inside the payload script, provided by the Shark-Jack firmware.

Example Usage

The user prepares a payload script which performs basic network auditing. Here, the user obtains an IP address via DHCP. The DHCP flow is initiated using the "NETMODE DHCP\_CLIENT" directive provided by the Shark Jack framework. Once an address is assigned, grep and sed is used to perform text manipulation on the output of the "ip addr" command, in order to filter the subnet. This subnet is then passed as a argument to nmap. A simple nmap with the option "-sn" is performed. This means that port scans and other elaborate scans are skipped. It is a fast way to determine available hosts. Additionally, a traceroute to Google servers is used to gain further insight into the network topology. The outputs of nmap and traceroute are appended to a loot file:

 #!/bin/bash
 #Using \ as pipe symbol because i dont know how to escape it in this wiki editor thingy
 LED SETUP
 NMAP_OPTIONS="-sn" LOOT_DIR=/root/loot/net
 mkdir -p $LOOT_DIR
 echo "Obtain IP address..." >> SLOOT_DIR/log.txt
 NETMODE DHCP_CLIENT
 while [ -z "$SUBNET" 1; do
 sleep 1 && SUBNET=$(ip addr \ grep -i eth0 \ grep -i inet \ grep -E -o" ( [0-91{1,3}[\. 1) {3710-91{1,33\/1{1}[0-91{1,23" \ sed 's/\.[0
 9]*\//\.01 //')
 done
 echo "Obtained IP address in subnet: $SUBNET" >> $LOOT_DIR/log.txt
 LED ATTACK
 echo "Starting nmap with options §NMAP_OPTIONS" >> $LOOT_DIR/log.txt
 nmap SNMAP_OPTIONS $SUBNET -ON SLOOT_DIR/net-scan.txt echo "Starting traceroute >> SLOOT_DIR/log.txt
 traceroute 8.8.8.8 > SLOOT_DIR/net-scan.txt
 echo "Done" >> $LOOT_DIR/log.txt
 echo "Inspect loot under SLOOT_DIR/net-scan.txt" >>
 $LOOT_DIR/log.txt
 LED FINISH
 sleep 2 && halt"

The user then puts the Shark Jack into arming mode and plugs the device into the Ethernet port of their machine. The user loads the prepared script onto the Shark Jack using scp. The Shark Jack is unplugged and switched into attack mode. It is ready to be deployed onto a target network. Once execution is done, the loot can be retrieved via arming mode.

Defense

- Make sure physical access to infrastructure is only possible for authorized personnel (lock doors to server rooms and server cabinets)

- Disable unused ports

- Physically inspect routers and switches on a regular basis

- Network segmentation, subnets, to reduce attack surface

- Monitor network for suspicious traffic

References

https://docs.hak5.org/shark-jack/getting-started/shark-jack-basics

https://github.com/hak5/sharkjack-payloads

Documentations

• Sniffing Devices ‎ (← links)