Tips & Tricks: Create Directory Without Name In Unix

Oneday, someone just hack my server, and then he downloads some C codes(exploit) from internet, compile it and run it. Oh my gosh! my server become freeze & the load is very high. It took all the resources on my server. By using command "ps axuf", i can see where this exploit running from. But, it's strange to see the path of this exploit.

 root@dns:# pwd  
 / /ex/exploit  
 root@dns:# cd /  
 root@dns:# ls  
    boot etc  initrd.img   lib     media opt  root selinux sys usr vmlinuz   webmin-setup.out  
 bin dev  home initrd.img.old lost+found mnt  proc sbin srv   tmp var vmlinuz.old xen  

There's a space on the path above. It seems that the hacker try to make a hidden directory with name " ",  a space character, we can't see this directory since it was just a space. Let's see how this hacker make this space directory:

 root@dns:# pwd  
 /root  
 root@dns:# mkdir " "  
 root@dns:# cd " "  
 root@dns:# pwd  
 /root/  
 root@dns:# mkdir a b c d  
 root@dns:# ls  
 a b c d  
 root@dns:# cd a  
 root@dns:# pwd  
 /root/ /a