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TA428, also tracked as ThunderCats, is a suspected Chinese-origin espionage threat cluster associated with targeted intrusions against government organizations in Russia and entities in Southeast Asia. The cluster has been linked to operations involving the PhantomNet/SManager and TManger malware families, and has also been discussed alongside suspected IronHusky activity. Related operations include SignSight and LagTimeIT. The actor’s activity reflects an intelligence-collection focus rather than financially motivated crime. In the documented May 2021 campaign against the FSB and other Russian government organizations, the malware known as Mail-O was assessed as a variant of PhantomNet/SManager and attributed to the broader TA428/ThunderCats umbrella based on tooling and behavioral overlap. Mail-O functioned as a downloader disguised as legitimate Mail.ru Disk-O software, using a real cloud service for command-and-control style tasking and payload retrieval. Reported overlaps included shared export conventions such as the unusual misspelled function name "Entery," use of a service-oriented execution flow via "ServiceMain," and similarities with PhantomNet/SManager and TManger tradecraft. Observed capabilities include initial access, persistence through service-based execution, post-exploitation payload delivery, and defense evasion through masquerading as legitimate software and blending communications with legitimate online services. The actor has demonstrated region-specific targeting and operational adaptability despite using tooling that has at times appeared comparatively rough or imperfect.
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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.
7 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
1 malware family attributed to this actor across reporting.
6 indicators attributed to this actor: domains, IPs, hashes, and other artifacts pulled from reporting. View more in app.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Activity cluster associated with the Mail-O malware used against the FSB and other Russian government organizations. The analysis argues Mail-O is a variant of PhantomNet/SManager and links this activity to the broader TA428 umbrella.
Cluster associated with the Mail-O malware used against the FSB and other Russian government organizations; the analysis argues Mail-O is a variant of PhantomNet/SManager and links the activity to a likely Chinese-origin ecosystem overlapping with TA428.
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.