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TA4922 is a Chinese-speaking, financially motivated cybercrime threat actor active since at least spring 2025. The group is assessed as distinct from espionage operations, although its tooling and ecosystem show overlap with clusters referred to as Silver Fox and Void Arachne. TA4922’s primary objective is to obtain remote access to victim environments for monetization through fraud, data theft, credential theft, access brokering, and persistent access. TA4922 initially concentrated on organizations in East Asia, especially Japan, and later expanded targeting to Taiwan, South Korea, Singapore, India, Malaysia, Indonesia, the United Kingdom, Germany, Italy, and South Africa. The actor uses highly localized social-engineering lures in the target’s language, commonly themed around tax authorities, payroll, invoicing, benefits, compliance, finance departments, and human resources. It frequently attempts to move victims from email to out-of-band platforms such as LINE, WhatsApp, and Microsoft Teams to continue social engineering, harvest contact information, and deliver malware outside normal email-security visibility. The group employs diverse initial-access and delivery methods including phishing links, archive attachments, credential-phishing pages, cloud-hosted malware staging, and DLL sideloading. TA4922 has used malware families and tooling including ValleyRAT, also known as Winos 4.0, Atlas RAT, RomulusLoader, SilentRunLoader, and commodity remote-access malware delivered through the Cruciferra crypter service. RomulusLoader has been used to deploy legitimate remote-management tools such as AnyDesk and SyncFuture, while SilentRunLoader has been used to steal Google Chrome credentials, cookies, and browsing data. Atlas RAT and related tooling provide broad post-compromise capability including system reconnaissance, arbitrary command execution, keylogging, clipboard theft, screenshot capture, audio capture, webcam capture, plugin or payload delivery, and other surveillance-oriented functions. TA4922 demonstrates strong defense-evasion tradecraft, particularly through DLL sideloading, modified and obfuscated malware, anti-analysis checks, process injection, and use of crypter-enabled delivery chains. Reporting also assessed with high confidence that the actor likely uses large language models to accelerate development of some Python-based malware. TA4922 is notable for a very high operational tempo and unusually broad campaign diversity relative to other tracked cybercrime 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.
32 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.
17 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.