Entry to Malaysia requires a valid passport.

You may visit ivisa: https://www.ivisa.com/apply-online to check if you require to apply for a visa from your point of origin.

The search result will also provide you with a list of contact information for the Malaysian embassy found in your respective countries by clicking the “Embassy Contact Info”.

You may also visit the Malaysian Immigration website on how to apply for a visa manually here: 
https://www.imi.gov.my/index.php/en/main-services/visa/apply-for-visa.html

Wikipedia has a detailed list of countries requiring visa which can be found here:
https://en.wikipedia.org/wiki/Visa_policy_of_Malaysia#Visa_free

If you have a stopover in another country prior to arriving in Malaysia, you may require a Transit Visa for that country’s airport. If you need to apply for a visa, please register for the conference, pay your registration and accommodation fees in full and request a visa letter from us at ask@info2020.my