Largest Multi-Agency Cyber Operation Mounted to Counter Threat Posed by Advanced Persistent Threat (APT) Actor UNC3886 to Singapore’s Telecommunications Sector

On 18 July 2025, Coordinating Minister for National Security Mr K Shanmugam shared that Advanced Persistent Threat (APT) actor UNC3886 had been detected attacking our critical infrastructure. No further details were shared then, to preserve operational security. Over the past months, our investigations have indicated that UNC3886 had launched a deliberate, targeted, and well-planned campaign against Singapore’s telecommunications sector. All four of Singapore’s major telecommunications operators