GoldenEyeDog Subgroup Linked to DigiCert Breach and Code-Signing Certificate Theft

GoldenEyeDog Subgroup Linked to DigiCert Breach and Code-Signing Certificate Theft Ravie LakshmananJul 17, 2026Malware / Threat Intelligence Cybersecurity researchers have attributed the April 2026 DigiCert security incident to a threat activity cluster dubbed CylindricalCanine. Expel, which shared technical details of the event, described the threat actor as a sub-group of GoldenEyeDog (aka APT-Q-27, Dragon Breath, and Miuuti Group), a Chinese cybercrime group known for its targeting of the gambling and gaming sectors using counterfeit websites to push malware-laced software. It's known to be active since at least 2015. "In April 2026, GoldenEyeDog used their malware to access a support member's device at DigiCert, a code-signing certificate provider, and leveraged their access to steal certificates intended for DigiCert customers," Expel security…