Very shiny, I don't see many hairs.
Can you get a clearer shot of the petiole? Not that I am any good with IDing ants outside of North America....
Can you also get a full side shot in better light? Like outside in light shade?
My wild guess would be an Azteca species - http://www.myrmecos....4/09/27/azteca/
http://www.antweb.or...t=allantwebants
I found one document that said they were in Malaysia, but Antweb is not showing them there.
Edit: Azteca looks like a New World ant, and would likely not be found in Malaysia. My mistake.
This site lists ants in Malaysia and Asia: http://www.antbase.n...inae/index.html
The Pseudolasius familiaris looks close, but we need better pictures first.