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TA4922 is a Chinese-speaking, financially motivated cybercrime group active since at least spring 2025. It primarily seeks remote access to victim environments to enable credential and data theft, fraud, persistence, and resale of access. The group historically concentrated on East Asian organizations, particularly in Japan, and has expanded targeting to India, Europe, South Africa, and mainland China. TA4922 uses highly localized phishing and social-engineering campaigns impersonating tax authorities, finance departments, human-resources teams, colleagues, and government services. It also moves engagements from email to messaging platforms including LINE, WhatsApp, and Microsoft Teams to evade email-security controls and continue social engineering. TA4922 has delivered credential-phishing content and malware through links and archives, frequently employing DLL sideloading. Its malware arsenal includes ValleyRAT/Winos4.0, Atlas RAT, RomulusLoader, SilentRunLoader, PackClient, and commodity RATs delivered through the Cruciferra crypter service. Observed functionality includes browser credential, cookie, and browsing-history theft; keylogging; screenshot, audio, and webcam capture; command execution; file operations; host and process discovery; payload deployment; process injection; and use of legitimate remote-management tools. TA4922 has some reported overlap in tooling, infrastructure, and social-engineering practices with the Silver Fox and Void Arachne ecosystems, but is tracked as a distinct crime-focused cluster rather than an espionage actor.
Mallory correlates actor tradecraft and target patterns against your stack, your sector, and your geography. See overlap before they land.
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.
39 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
9 malware families attributed to this actor across reporting.
4 additional families tracked in Mallory.
136 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Financially motivated group conducting tax-themed phishing campaigns to deliver the PackClient remote-access trojan. It historically targets small and medium-sized organizations in East Asia and has recently expanded targeting to Europe and the UK.
A Chinese-speaking threat actor expanding its initial-access arsenal with the PackClient modular C2 framework, which supports data theft, surveillance, and delivery of additional plugins and payloads.
Referenced only as a comparison for the use of an IMG disk-image delivery lure; the content does not attribute the observed PackClient and attacker-operated ManageEngine Endpoint Central intrusion to TA4922.
Conducting tax-themed phishing campaigns against organizations in China and India to deliver the PackClient RAT, with follow-on remote-management tooling observed after compromise.
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.