Penal Code Section 121
Waging or attempting to wage war or abetting the waging of war against the Yang di-Pertuan Agong, a Ruler or Yang di-Pertua Negeri
121. Whoever wages war against the Yang di-Pertuan Agong or against any of the Rulers or Yang di-Pertua Negeri, or attempts to wage such war, or abets the waging of such war, shall be punished with death or imprisonment for life, and if not sentenced to death shall also be liable to fine.
Please refer to the Attorney General's Chamber of Malaysia's website for the latest law.