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Tanaka is a cybercriminal data leak broker active in the underground economy and notable for high-volume publication of stolen data. The actor has been identified as a leading leak-focused threat actor in the first half of 2026, with activity characterized by numerous distinct leak posts and broad victim coverage across multiple industries and regions. Tanaka’s operations align with an encryption-less extortion and illicit data monetization model in which stolen information is exposed, sold, or otherwise leveraged as a standalone criminal commodity rather than solely as a byproduct of ransomware. Observed targeting spans organizations in North America, Europe, and the United Kingdom, with especially strong exposure affecting banking, financial services, and insurance entities, as well as government and technology organizations. The actor’s behavior indicates a focus on exfiltrated data monetization, including leak publication and likely downstream criminal use such as fraud, resale, or coercive pressure. Based on the available facts, Tanaka is best characterized as a financially motivated cybercriminal actor specializing in data-theft-driven extortion and brokering rather than a state-sponsored intrusion set.
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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.
1 distinct technique observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.
1 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.