I have an urgent inquiry to any one who can answer this, maybe someone familiar in the law and legislation field?

I took up a tuition loan and study loan in SG 5-6 years back. Owing to bad financial circumstances, I left SG without completing my studies, now owing the banks RM50,000. 2 banks to be exact. One is a local SG bank, the other OCBC. I have not made any repayments for 2 years now. I am wondering what action can they take against me. Can they take up action against me/sue me now that I am in Malaysia?