[cobalt-users] RAQ4 Some system files change ex: ls, top, netstat, login What's wrong ?

[Nucharin Jansen <nucharin@xxxxxxxxxxx>]

Hello,

I couldn't access website at 18 - 20th. 
I request to reboot the RAQ4.
When NOC reboot at 20th, I can't SSH.
So, I enable  and use telnet to check.
I found that many system files was replace by new one.
ex:

 /bin
-rwxr-xr-x   1 root     root       184023 Oct 18 22:03 ls
-rwxr-xr-x   1 root     root       258612 Oct 18 22:03 netstat
-rwxr-xr-x   1 root     root        47388 Oct 18 22:03 ps
-rwxr-xr-x   1 root     root        43336 Oct 18 22:03 login

/sbin
-rwxr-xr-x   1 root     root        28696 Oct 18 22:03 syslogd

/usr/bin
-rwxr-xr-x   1 root     root       117311 Oct 18 22:03 du
-rwxr-xr-x   1 root     root        22459 Oct 18 22:03 killall
-rwxr-xr-x   1 root     root        24147 Oct 18 22:03 pstree
-rwxr-xr-x   1 root     root        68692 Oct 18 22:03 top

I never ever install anything before. 
I asked the NOC sys engineer there.  they never touch my bluebox.
Do you have any suggestion ? 
It is automatic restore or hacking ?
I can't use "ps -efw" to list all processes too. 

Thank
Nucharin J.