chkrootkit email says Suspect directory dev/rd/cdb FOUND!

The email report that is generated by rootkit (/root/chkrootkit.sh | grep -v .packlist) has reported what's below. The items in italics are new and of concern. Unfortunately, this started a few weeks ago and I did not notice. I would really like to know what is is and how it might have gotten there, and what damage has been/can be done by this. I would also like to know if it is safe to remove that folder & contents Server is on CENTOS 7.8 & WHM 88.0.13 and I believe is well secured, so I'm puzzled. TIA for your help. [QUOTE]find: "/proc/26711": No such file or directory find: "/proc/26724": No such file or directory find: "/proc/26732": No such file or directory find: "/proc/26810": No such file or directory /dev/rd/cdb/mig/mig-logcleaner Suspect directory dev/rd/cdb FOUND! Looking for sniffer logs /dev/rd/cdb /dev/rd/cdb/mig /dev/rd/cdb/mig/mig /dev/rd/cdb/mig/mig_logcleaning.txt /dev/rd/cdb/mig/makefile /dev/rd/cdb/mig/mig-logcleaner /dev/rd/cdb/mig/backup /dev/rd/cdb/mig/backup/mig-logcleaner-original.c /dev/rd/cdb/mig/README.md /dev/rd/cdb/mig/LICENSE /dev/rd/cdb/mig/readme.mig /dev/rd/cdb/mig/mig-logcleaner.c /dev/rd/cdb/mig.tgz /usr/lib/debug/usr/.dwz not tested INFECTED PORTS: ( 465) not tested