Our webhosting account has been hacked by someone known as kernal_panic. We managed to recover few datas and still working on it.
As for now, dont forget to update your system and applications. 😉
I will post more details on this issue later, working on data recovery right now.
Update: As for our log analyzing result, we have confirmed the attacker came from the not updated wordpress version. We have missed to update this wordpress, 1 week after the released version. We have learned for it and took positive action on it.