Rkhunter reported me that it found hidden files in /etc:

```
Warning: Hidden file found: /etc/.group.48239632746: ASCII text
Warning: Hidden file found: /etc/.passwd.13046384800: ASCII text
Warning: Hidden file found: /etc/.passwd.14350544901: ASCII text
Warning: Hidden file found: /etc/.passwd.16941124733: ASCII text
Warning: Hidden file found: /etc/.passwd.22154181091: ASCII text
Warning: Hidden file found: /etc/.passwd.48239632746: ASCII text

```

Should I be worried about it? 

It seems those files are copies of the original passwd file....

Regards