Hidden directories in /var/spool .

Hi all,

i notice something fishy in /var/spool
when i try do a "ls -l"
it give:
/bin/ls: .sniffer: No such file or directory
/bin/ls: .pwdhack: No such file or directory
/bin/ls: skng: No such file or directory

can someone tell me how to uncover those hidden directories?
and is there something that we can secure /var/spool and other vulnerable directories?

 

 

 

 

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