Was tein.co.jp hit by ransomware?

tein.co.jp was listed by the warlock ransomware operation (Japan), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the warlock ransomware group?

warlock is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the tein.co.jp breach?

warlock published data attributed to tein.co.jp. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

TEIN, INC.

listed as tein.co.jp · Claimed by Warlock · listed 7 months ago

Age

since listed · data leaked

Status timeline

ListedNov 6, 2025
Data leakeddate unknown

At a glance

Group: Warlock
Status: Data leaked
Country: Japan
Sector: Technology
Listed on leak site: Nov 6, 2025

About the victim

AI dossier — public-source company profile

TEIN, INC. (株式会社テイン) is a Japanese manufacturer and retailer of automotive suspension components, including coilover dampers, lowering springs, and 4x4 suspension products for a wide range of passenger and performance vehicles. The company sells its products through retail partners and an online shop across Japan and internationally via a global site. TEIN is a publicly listed company (IR disclosures referenced on its website) based in Japan.

Industry: Automotive Suspension & Performance Parts Manufacturing

Attack summary

Severity: high — The attack is confirmed by the victim company itself via public notices on their website, indicating operational disruption and a ransomware infection; disclosed status is 'data_published', meaning data was exfiltrated and released, though the specific contents are not enumerated in the leak post.

The ransomware group 'warlock' claims an attack on TEIN, INC., with the company's own website confirming a ransomware infection causing system disruption (notices dated November 2025 and a final report in April 2026). The leak post provides no description of specific data exfiltrated or encrypted volumes, but the disclosed status indicates data has been published.

high

Data the group says was taken

AI dossier — extracted from the leak post

Unknown — no specific data inventory disclosed in leak post

What the group claims

No description provided.

Sources

Victim sitetein.co.jp

Source

Indexed 7 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 warlock

Warlock is an emerging ransomware group that first appeared in June 2025, primarily motivated by financial gain through extortion operations targeting organizations across multiple sectors. The group's origin and potential affiliations remain unclear due to limited public documentation from established threat intelligence sources, though their targeting pattern spans both Western nations and Russia, suggesting possible opportunistic rather than geopolitically-motivated operations. Based on available victim data, Warlock has demonstrated capability to compromise organizations across diverse sectors including technology, financial services, telecommunications, and healthcare, with their attack methodology and technical capabilities requiring further analysis by security researchers to establish definitive patterns regarding initial access vectors, encryption methods, or data exfiltration tactics. While the group has accumulated 78 documented victims across the United States, Japan, Russia, Great Britain, and Turkey within their initial months of operation, insufficient public reporting from CISA, FBI, or major security firms exists to detail specific notable campaigns, ransom demands, or high-profile incidents. Given the group's recent emergence in mid-2025, their current operational status and potential evolution remain under observation by the cybersecurity community. The group has been linked to 78 public disclosures across our corpus. First observed on a leak site on June 11, 2025; most recent post November 6, 2025. The operation is currently inactive.

Timeline of this disclosure

November 6, 2025tein.co.jp listed by warlockon the group's public leak site

Other recent disclosures by warlock

warlock has been linked to 78 public victims on Darkfield. A sample of the most recent:

See the full warlock dossier →

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 3,544 disclosures indexed across all operators we track. Geographically, tein.co.jp is reported in Japan, a country with 220 ransomware disclosures in our corpus.

If your organisation is affected

A listing by warlock means tein.co.jp 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 warlock'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.