Exercise 9-4: Kali live build – right tool for the right job

Exercise 4 – Kali live build – right tool for the right job

In this scene of Mr Robot, Angela had to boot up a Kali USB drive, and enter several commands in order to get her job done. Can you build a custom Kali ISO that would improve on this? Automate the process so that Angela doesn’t have to touch the keyboard after booting Kali.

Build a live ISO for Angela. Show her how it’s done!


# Update your system!
apt-get update
apt-get dist-upgrade

# Install needed tools
apt install -y git live-build cdebootstrap curl

# Clone Kali live build config files
git clone git://gitlab.com/kalilinux/build-scripts/live-build-config.git

# Overwrite default package lists with minimal needed packages
cd live-build-config/
cat kali-config/variant-default/package-lists/kali.list.chroot
echo cryptsetup > kali-config/variant-default/package-lists/kali.list.chroot
echo openssh-server >> kali-config/variant-default/package-lists/kali.list.chroot
echo nmap >> kali-config/variant-default/package-lists/kali.list.chroot

# Add files to live filesystem (Configure custom startup script)
mkdir -p kali-config/common/includes.chroot/lib/systemd/system/

# Register a custom "Angela" service to run /usr/bin/startssh
cat << EOF > kali-config/common/includes.chroot/lib/systemd/system/angela.service
[Unit]
Description=Start Custom Script
After=multi-user.target

[Service]
Type=idle
ExecStart=/bin/bash /usr/bin/startssh

[Install]
WantedBy=multi-user.target
EOF

# Create /usr/bin (and parents) on live file system
mkdir -p kali-config/common/includes.chroot/usr/bin/

# Create a "startssh" script to do our nefarious things
cat << EOF > kali-config/common/includes.chroot/usr/bin/startssh
#!/bin/sh
echo hola > /root/test.txt
EOF

# Create live hook to enable our custom service
cat << EOF > kali-config/common/hooks/live/angela.chroot
#!/bin/sh
systemctl enable angela.service || true
EOF

# Make it executable
chmod 755 kali-config/common/hooks/live/angela.chroot

# Create boot config file, adjust prompt, timeout, autoboot, etc:
cat << EOF > kali-config/common/includes.binary/isolinux/isolinux.cfg
include menu.cfg
default vesamenu.c32
prompt 0
timeout 20
ONTIMEOUT live-amd64
EOF

# Build the ISO!
./build.sh --verbose

# Update your system!

apt-get update

apt-get dist-upgrade

# Install needed tools

apt install -y git live-build cdebootstrap curl

# Clone Kali live build config files

git clone git://gitlab.com/kalilinux/build-scripts/live-build-config.git

# Overwrite default package lists with minimal needed packages

cd live-build-config/

cat kali-config/variant-default/package-lists/kali.list.chroot

echo cryptsetup > kali-config/variant-default/package-lists/kali.list.chroot

echo openssh-server >> kali-config/variant-default/package-lists/kali.list.chroot

echo nmap >> kali-config/variant-default/package-lists/kali.list.chroot

# Add files to live filesystem (Configure custom startup script)

mkdir -p kali-config/common/includes.chroot/lib/systemd/system/

# Register a custom "Angela" service to run /usr/bin/startssh

cat << EOF > kali-config/common/includes.chroot/lib/systemd/system/angela.service

[Unit]

Description=Start Custom Script

After=multi-user.target

[Service]

Type=idle

ExecStart=/bin/bash /usr/bin/startssh

[Install]

WantedBy=multi-user.target

EOF

# Create /usr/bin (and parents) on live file system

mkdir -p kali-config/common/includes.chroot/usr/bin/

# Create a "startssh" script to do our nefarious things

cat << EOF > kali-config/common/includes.chroot/usr/bin/startssh

#!/bin/sh

echo hola > /root/test.txt

EOF

# Create live hook to enable our custom service

cat << EOF > kali-config/common/hooks/live/angela.chroot

#!/bin/sh

systemctl enable angela.service || true

EOF

# Make it executable

chmod 755 kali-config/common/hooks/live/angela.chroot

# Create boot config file, adjust prompt, timeout, autoboot, etc:

cat << EOF > kali-config/common/includes.binary/isolinux/isolinux.cfg

include menu.cfg

default vesamenu.c32

prompt 0

timeout 20

ONTIMEOUT live-amd64

EOF

# Build the ISO!

./build.sh --verbose

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Exercise 4 – Kali live build – right tool for the right job

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