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TA4922 is a Chinese-speaking, financially motivated cybercrime threat actor active since at least spring 2025. The group initially focused on organizations in East Asia, especially Japan, and later expanded to targets in Europe, Southeast Asia, India, and South Africa. TA4922 is associated with fraud, data theft, credential theft, access brokering, and maintaining remote access to victim environments. Reporting has identified overlap in tooling, infrastructure, and social-engineering patterns with Silver Fox, and some activity has also been discussed alongside the broader Winos4.0 or ValleyRAT ecosystem. TA4922 is notable for a very high campaign tempo and for running diverse, localized phishing operations. Its lures commonly impersonate tax authorities, payroll and finance teams, human resources staff, benefits administrators, compliance functions, invoices, and other business communications, typically adapted to the target region’s language and business context. The actor also attempts to move conversations from email to messaging platforms such as LINE, WhatsApp, and Microsoft Teams to continue social engineering, harvest contact information, and deliver malware outside normal email-security visibility. The actor’s malware arsenal includes ValleyRAT or Winos4.0, Atlas RAT, RomulusLoader, SilentRunLoader, and AsyncRAT, and it has also used legitimate remote management software such as AnyDesk and SyncFuture after initial compromise. SilentRunLoader has been used to steal Google Chrome credentials, cookies, and browsing data. Atlas RAT provides modular backdoor functionality including system reconnaissance, command execution, keylogging, clipboard theft, screenshot capture, audio recording, webcam capture, and file operations. RomulusLoader has been used to download and execute follow-on payloads, establish persistence, and inject code into legitimate processes. TA4922 has also been linked to campaigns using the Cruciferra crypter service to deliver malware while increasing defense evasion. Observed tradecraft includes phishing-based initial access, credential theft, session hijacking through browser cookie theft, DLL sideloading, process injection, persistence, exfiltration, and defense evasion. Campaigns have used archive-based delivery, malicious links, staged payload retrieval, and sideloaded malicious libraries. The actor has shown sustained adaptation in malware development and delivery methods, and some newer Python-based tooling has been assessed as likely developed with assistance from large language models. Although TA4922 is assessed primarily as a cybercrime actor rather than an espionage operator, several of its tools have surveillance-capable functionality that could also support intelligence collection or be transferred to other actors.
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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.
36 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
7 malware families attributed to this actor across reporting.
2 additional families tracked in Mallory.
116 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Chinese cybercrime actor expanding globally, using seasonal HR/tax/payroll lures for fraud, data theft, and credential theft.
A Chinese-speaking threat group observed using Cruciferra in income-tax-themed phishing campaigns targeting Indian taxpayers, tax professionals, and corporate finance teams via fake landing pages hosting ZIP files disguised as tax documents.
Chinese-speaking cybercrime actor attributed with tax-themed phishing campaigns targeting Indian taxpayers, tax professionals, and corporate finance teams, using attacker-controlled landing pages hosting ZIP files to deliver malware and leveraging the Cruciferra crypter.
TA4922 is identified in the IoCs as the threat actor using the Cruciferra crypter in campaigns delivering AsyncRAT payloads via tax-themed lures and malicious downloads.
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.