Yet another proof that Halimah is indeed a Malay. It's a literal translation from her native language, i.e. Malay.
Formal Malay: "Berbuat baik lakukan bersama-sama".
Informal Malay: "Buat baik-baik buat sama-sama".
If she is an Indian, she would have used this as her slogan:
"Intavoru inta peṇkuṟikaḷ makkaḷai vimarcittu ennai"