This file is indexed.

/etc/logcheck/ignore.d.server/wu-ftpd is in logcheck-database 1.3.16.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

1
^\w{3} [ :0-9]{11} [._[:alnum:]-]+ wu-ftpd(\[[0-9]+\])?: PAM-listfile: Refused user [._[:alnum:]-]+ for service wu-ftpd$