At the time of writing, Malaysian passport holders can enter Iran visa-free for vacation travel of up to 15 days. Dress modestly. While a chador is unnecessary, women travellers are expected to wear headscarves and cover at least the back of their heads. International credit cards are generally not accepted. Be sure to bring sufficient cash in US dollar or euro. Internet censorship is relatively strict. To get around it, install a VPN on your device before arrival. Avoid the thumbs-up sign, it is considered an obscene gesture in Iran and might land you in hot water.