Singapore says its four biggest phone companies hit by Chinese hackers

• UNC3886 targets Singapore’s four major telecommunications companies in a state-sponsored cyber campaign.
• The attackers used rootkits and zero-day firewall exploits, but failed to steal sensitive data.
• Singapore confirmed limited unauthorized access, no disruption or exfiltration, China expected to deny involvement

The Singapore government said its four main telecommunications providers have been targeted by Chinese state-sponsored threat actors, known as UNC3886.

The attack was first spotted in mid-July 2025, but was not made public at the time, so as not to endanger the ongoing investigation and implemented countermeasures.