Today , just a few minutes ago , Google Malaysia got hacked by well known Pakistani Hacker with the code name 1337 from Team Madleets. 1337 is a well known hacker for many big hacks like this in the past. It seems that the method used in this attack was DNS Hijacking where the hacker has managed to hack the Domain Registrar and replaced the ip with it’s own server.
There is no reason behind this hack.
This is the message on the deface page: