HoneyMyte APT Unleashes Kernel-Mode Rootkit with ToneShell Backdoor in Southeast Asia
In early 2025, the HoneyMyte APT group launched a targeted cyberespionage campaign against government organizations in Southeast and East Asia, primarily Myanmar and Thailand. Leveraging a stolen digital certificate, HoneyMyte deployed a malicious kernel-mode rootkit disguised as a signed driver to inject the advanced ToneShell backdoor into high-privilege system processes. The attack chain delivered full process, registry, and file protection for malicious activity, making removal and detection by security tools exceedingly challenging. The backdoor enabled covert remote access, data exfiltration, and command execution via communications camouflaged to resemble legitimate encrypted TLS traffic. This incident is a stark example of modern APT evolution, showcasing new levels of stealth and persistence through kernel-level threats and advanced obfuscation. It highlights a broader shift towards supply-chain and trusted-cert abuse, increasing risk for public sector and critical infrastructure targets in the Asia-Pacific region.
Kill Chain