Install:

apt install rkhunter

Configure directory debian:

nano /etc/default/rkhunter

Set:

CRON_DAILY_RUN="true"
CRON_DB_UPDATE="true"
DB_UPDATE_EMAIL="false"
REPORT_EMAIL="martin.hasin@mhasin.local"
APT_AUTOGEN="true"

Set in:

nano  /etc/rkhunter.conf

set:

UPDATE_MIRRORS=1
MIRRORS_MODE=0
MAIL-ON-WARNING=martin.hasin@mhasin.local
ALLOWDEVFILE=/dev/shm/PostgreSQL.*
ALLOWIPCPROC=/usr/sbin/apache2
WEB_CMD=""
XINETD_ALLOWED_SVC=/etc/xinetd.d/ftp_psa
XINETD_ALLOWED_SVC=/etc/xinetd.d/poppassd_psa
XINETD_ALLOWED_SVC=/etc/xinetd.d/smtp_psa
XINETD_ALLOWED_SVC=/etc/xinetd.d/smtps_psa
XINETD_ALLOWED_SVC=/etc/xinetd.d/submission_psa
XINETD_ALLOWED_SVC=/etc/xinetd.d/check_mk