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Client called me because can't access to the application. So login in system and surprise! I cant execute ps, ls and netstat commands and postgresql is down. These files has other owners.

The last lines in dmesg are like :

[21461.249801] ssh-scan[11199]: segfault at 0 ip 0000000008048e33 sp 00000000ffd12d10 error 4 in ssh-scan[8048000+c0000]

What could be the problem? And the solution?

The OS: Ubuntu Server 12.04LTS x64

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That server has probably been hacked. – Oliver May 30 '12 at 15:12
up vote 7 down vote accepted

You've been compromised an the attacker seems to have been running an ssh scanning bot against external hosts.

The solution is up to you, but I suspect that you will need to rebuild the server after recovering any important data.

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