PeckBirdy

PeckBirdy: A Versatile Script Framework for LOLBins Exploitation Used by China-aligned Threat Groups | TrendAI (US)

Researchers detailed multiple China-aligned intrusion sets using modular tooling to compromise targets across Windows, web, and mobile environments. ESET said TheWizards used a tool called Spellbinder to abuse IPv6 SLAAC by sending rogue ICMPv6 Router Advertisements, positioning the attackers as the default gateway for adversary-in-the-middle operations. The group then intercepted DNS requests for Chinese software vendors and redirected update traffic so legitimate applications such as Tencent QQ and previously Sogou Pinyin fetched malicious payloads instead of real updates. The resulting infection chain used a downloader DLL, an encrypted blob, and in-memory loading of the WizardNet backdoor, which patched AMSI and ETW, supported modular execution, and injected shellcode into other processes while maintaining encrypted command-and-control. Separate reporting described broader China-linked operations using flexible malware delivery and post-compromise frameworks. Trend Micro tied Earth Minotaur to the MOONSHINE Exploit Kit and the DarkNimbus Android backdoor, while TrendAI documented PeckBirdy, a JScript-based framework used since 2023 across browsers, MSHTA, WScript, Classic ASP, Node.js, and .NET ScriptControl for watering-hole attacks, credential theft, lateral movement, reverse shells, and persistent backdoor access. PeckBirdy was observed in campaigns against Chinese gambling sites, Asian government entities, and private organizations, alongside modular backdoors HOLODONUT and MKDOOR. The reporting also noted infrastructure and tooling overlaps linking some of these activities to UNC3569, Earth Baxia, and supplier UPSEC, underscoring an ecosystem of China-aligned operators reusing shared malware, hijacking infrastructure, and fake software-update lures.