There's a recent leak that garnered a lot of noise on social media and an embarrassment of sorts for both China and Malaysia due to their perceived "friendly" ties based on public pronouncements from both leaders of the 2 countries, but most of all to the current P.M. Anwar Ibrahim who's been trying to foster a more friendly and warm relations with China for economic and trade reasons.
I am inclined to believe that Western intelligence agencies have double-agents, moles, spies working on a lot of these ASEAN countries like Malaysia, Indonesia, Thailand, the Philippines etc..due to these countries relationship and histories with their colonizers. Most of these countries still have a lasting, warmth, and slavish relationship with western countries due to the perceived and real outlook of western countries economic, military, political, and cultural appeal. To be associated with western countries is still seen as a sign of status and class and China is not immune to this entrenched belief.