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YY Lai Yu is a Chinese-language phishing-as-a-service platform active since at least November 2025. It operates as part of a broader China-based criminal phishing ecosystem and provides a mature service model for large-scale credential and payment fraud. The platform has offered more than 400 phishing templates and is notable for strong localization, especially against Japanese consumers, expanding beyond generic banking lures to impersonate major Japanese brands and exploit local consumer behaviors. YY Lai Yu specializes in phishing campaigns designed to harvest payment card data and one-time passwords, with infrastructure and workflows that support real-time victim interaction. Its operators have used lures themed around loyalty-point redemption, expiring rewards, and electricity-subsidy messaging tailored to Japanese residents. The platform supports bulk delivery through encrypted mobile messaging channels including RCS and iMessage, indicating a mobile-centric distribution model. Operational features attributed to YY Lai Yu include geographic filtering, payment-card filtering based on bank identification number ranges, anti-bot human-verification gates, domain management, and operator account administration. Its phishing pages use manual-click verification screens to hinder automated analysis, and its administration panel allows customers to query stolen data, manage phishing domains, create operator accounts with permissions, and control country-level targeting restrictions. The platform has been documented targeting consumers across 119 countries, although Japan appears to be its strongest focus. YY Lai Yu is best characterized as a financially motivated criminal service enabling phishing and payment-card fraud at scale. Its tooling lowers the barrier to entry for less technically capable operators while supporting synchronized victim engagement and evasive controls commonly associated with modern phishing-as-a-service operations.
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Who, where, and (when attributed) which flag flies behind the operation. Pulled from open-source reporting and Mallory's analyst review.
Sectors the actor has been observed targeting.
Geographies tied to known operations.
Attributed origin per open-source reporting.
5 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Match sector + geo + tech-stack targeting against your real footprint.
Every observed MITRE ATT&CK technique, grouped by tactic.
Families this actor is known to deploy, with IOCs and behavior.
CVEs this actor has used in known campaigns.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Domains, IPs, and hashes tied to this actor, refreshed continuously.