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J.S.T. España, S.A.

listed as jst.es · Claimed by Blacksuit · listed 2 years ago

20m
Age
since listed · data leaked

Status timeline

  1. ListedNov 12, 2024
  2. Data leakeddate unknown

At a glance

Group
Blacksuit
Status
Data leaked
Country
Spain
Sector
Technology
Listed on leak site
Nov 12, 2024

About the victim

AI dossier — public-source company profile

J.S.T. España, S.A. is the Spanish subsidiary of JST MFG CO., LTD., a Japanese multinational founded in 1957 and headquartered in Osaka. The company is a world-leading manufacturer of solderless terminals, connectors, and related equipment for the electrical and electronics industry, serving automotive, telecommunications, and industrial sectors.

Industry
Electrical Connectors & Electronics Manufacturing
Founded
1981

Attack summary

Severity: medium — Data has been published (disclosed_status confirms 'data_published'), indicating confirmed exfiltration. However, no specific data categories, volume, or sensitivity level are disclosed in the available post or public information. The company manufactures industrial components, not typically a source of regulated personal or financial data at scale, though intellectual property or client lists may be at risk.

Blacksuit claims to have compromised J.S.T. España and published data from the breach. The leak post does not specify whether encryption, exfiltration, or both were involved, nor does it detail what categories of data were taken.

medium

What the group claims

J.S.T. España, S.A., founded in 1981, belongs to the Japanese multinational based in Osaka, J.S.T. MFG CO.,LTD. One of the world's leading manufacturers of connectors and terminals for the electrical and electronics industry.

Sources

Source

Indexed 2 years 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 Blacksuit

Blacksuit is a financially motivated ransomware group that emerged in June 2023, quickly establishing itself as a significant threat with 184 documented victims across multiple sectors. The group's origin and specific affiliations remain largely undocumented in public threat intelligence reports, though their operational patterns suggest they operate as an independent entity rather than a traditional RaaS model. Blacksuit primarily targets organizations through common initial access vectors and employs standard ransomware deployment techniques, though detailed technical analysis of their specific encryption methods and whether they consistently employ double extortion tactics has not been widely published by major security firms. The group has demonstrated a clear preference for targeting business services, healthcare, government, and manufacturing sectors, with their victims predominantly located in English-speaking countries including the United States, United Kingdom, and Canada, as well as Spain and Germany. As of current reporting, Blacksuit remains an active ransomware operation with no publicly documented law enforcement disruptions or significant rebranding efforts. The group has been linked to 184 public disclosures across our corpus. First observed on a leak site on June 12, 2023; most recent post June 2, 2025. The operation is currently inactive.

Also tracked as: black suit.

Timeline of this disclosure

  • November 12, 2024jst.es listed by Blacksuiton the group's public leak site

Other recent disclosures by Blacksuit

Blacksuit has been linked to 184 public victims on Darkfield. A sample of the most recent:

See the full Blacksuit dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,563 disclosures indexed across all operators we track. Geographically, jst.es is reported in Spain, a country with 351 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Blacksuit means jst.es 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, INCIBE-CERT (Spain), as required for your jurisdiction.
  • Monitor for the data appearing on Blacksuit'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.