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TANI & ABE

Claimed by Blacknevas · listed 11 months ago

11m
Age
since listed · data leaked

Status timeline

  1. ListedAug 6, 2025
  2. Data leakeddate unknown

At a glance

Group
Blacknevas
Status
Data leaked
Country
Japan
Listed on leak site
Aug 6, 2025

About the victim

AI dossier — public-source company profile

TANI & ABE is a Japanese patent and trademark law firm (弁理士法人) established in 1977 and headquartered in Tokyo. The firm provides services in patent applications, design and trademark registration, and licensing contracts.

Industry
Legal Services - Intellectual Property & Patent Law
Address
Tokyo, Japan
Founded
1977

Attack summary

Severity: high — Law firm handling sensitive intellectual property and client confidential information; likely exposure of attorney-client privileged communications and trade secrets belonging to multiple clients, even though specific proof count and data inventory are not detailed in the post.

The blacknevas group claims to have attacked TANI & ABE and published data from the firm. No specific details are provided in the truncated leak post regarding what was encrypted, exfiltrated, or the nature of the data compromised.

high

Data the group says was taken

AI dossier — extracted from the leak post
  • Client documents
  • Patent filings
  • Trademark registration records
  • Legal contracts

What the group claims

TANI & ABE is a patent and trademark law firm established in 1977 and headquartered in Tokyo, Japan.

Sources

Source

Indexed 11 months ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About blacknevas

Blacknevas is an emerging ransomware group that was first observed in August 2025, appearing to be primarily financially motivated based on their targeting patterns and operational characteristics. The group's origin and potential affiliations remain unclear due to limited public documentation from established threat intelligence sources, though their diverse geographic targeting suggests either a distributed operation or broad opportunistic approach. Based on available victim data, Blacknevas has compromised at least 23 organizations across multiple countries, with the United States, Spain, India, Japan, and Thailand being the most frequently targeted nations, while their sector focus spans technology, manufacturing, energy, and consumer services industries, suggesting they employ opportunistic rather than sector-specific targeting methodologies. The group's attack vectors, specific tools, and whether they operate as a Ransomware-as-a-Service model or maintain independent operations have not been publicly documented by major cybersecurity firms or government agencies. Due to the group's recent emergence in August 2025, there is insufficient public reporting from established sources like CISA, FBI, or major threat intelligence providers to detail notable campaigns or significant attacks beyond the confirmed victim count. Given the recency of their first observed activity, Blacknevas appears to remain active as of late 2025, though comprehensive threat intelligence profiles from authoritative sources have yet to be published. The group has been linked to 36 public disclosures across our corpus. First observed on a leak site on August 6, 2025; most recent post July 14, 2026. The operation is currently active.

Also tracked as: black nevas.

Timeline of this disclosure

  • August 6, 2025TANI & ABE listed by blacknevason the group's public leak site

Other recent disclosures by blacknevas

blacknevas has been linked to 36 public victims on Darkfield. A sample of the most recent:

See the full blacknevas dossier →

Sector and geography

Geographically, TANI & ABE is reported in Japan, a country with 220 ransomware disclosures in our corpus.

If your organisation is affected

A listing by blacknevas means TANI & ABE appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

  • Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
  • Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
  • Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
  • Report the incident to your national CERT, JPCERT/CC (Japan), as required for your jurisdiction.
  • Monitor for the data appearing on blacknevas's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.