Was SAKAI SOUKEN Co. hit by ransomware?

SAKAI SOUKEN Co. was listed by the hunters 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 hunters ransomware group?

hunters 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 SAKAI SOUKEN Co. breach?

hunters published data attributed to SAKAI SOUKEN Co.. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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SAKAI SOUKEN Co.

Claimed by Hunters · listed 1 year ago

17m

Age

since listed · data leaked

Status timeline

ListedFeb 8, 2025
Data leakeddate unknown

At a glance

Group: Hunters
Status: Data leaked
Country: Japan
Sector: Manufacturing
Listed on leak site: Feb 8, 2025

About the victim

AI dossier — public-source company profile

SAKAI SOUKEN Co. is a Japanese construction and real estate development company specializing in land utilization, residential rental properties, commercial facilities (factories, warehouses, shops), and healthcare/medical/welfare buildings. The company operates multiple branch offices across central Japan and manages subsidiary companies including Ontech Co., Ltd.

Industry: Real Estate Development & Construction

Attack summary

Severity: high — Confirmed exfiltration and encryption of data from a significant construction/real estate company with multiple branch offices and client base. The company published incident notices acknowledging unauthorized access, indicating material impact. Sensitive business and client data likely compromised.

The hunters group claims to have both exfiltrated data and encrypted systems at SAKAI SOUKEN Co. The company's website confirms unauthorized access incidents occurred in January, March, and May 2025, with final reports published.

high

Data the group says was taken

AI dossier — extracted from the leak post

Business documents
Client information
Project records
Operational data

What the group claims

Exfiltraded data : yes - Encrypted data : yes

Sources

Victim sitesakai.co.jp
Leak posthttps://hunters55rdxciehoqzwv7vgyv6nt37tbwax2reroyzxhou7my5ejyid.onion/companies/0861390796

Source

Indexed 1 year 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 hunters

Hunters International is a ransomware group first observed in October 2023 that operates with primary financial motivations, having claimed responsibility for attacks against at least 307 known victims across a broad range of sectors and geographies. The group is believed to have acquired the source code and infrastructure of the defunct Hive ransomware operation following Hive's disruption by law enforcement in January 2023, though Hunters International has publicly disputed characterizations that it is a direct Hive rebrand, asserting instead that it independently purchased the codebase; the group operates as a Ransomware-as-a-Service model, recruiting affiliates to conduct intrusions on its behalf. Hunters International employs double extortion tactics, exfiltrating victim data prior to encryption and threatening public release on a dedicated leak site to increase pressure on victims to pay; initial access vectors observed across reported incidents include phishing, exploitation of publicly exposed remote services, and credential abuse, with the group deploying its Rust-based encryptor derived from Hive's codebase. The group has demonstrated a notably indiscriminate targeting pattern, with victims concentrated in the United States, United Kingdom, Canada, France, and Germany spanning Business Services, Manufacturing, Technology, Healthcare, and Energy sectors, reflecting a financially opportunistic rather than strategically selective approach; no single landmark ransom payment or named high-profile campaign has been singularly attributed to the group in major public reporting as of available documentation. As of the most recent publicly available threat intelligence reporting, Hunters International remains an active and operational ransomware threat with a growing victim count and no confirmed law enforcement disruption or rebranding. The group has been linked to 307 public disclosures across our corpus. First observed on a leak site on October 20, 2023; most recent post May 27, 2025. The operation is currently inactive.

Also tracked as: Hunters International.

Timeline of this disclosure

February 8, 2025SAKAI SOUKEN Co. listed by hunterson the group's public leak site

Other recent disclosures by hunters

hunters has been linked to 307 public victims on Darkfield. A sample of the most recent:

See the full hunters dossier →

Sector and geography

This disclosure adds to ransomware activity in the Manufacturing sector, which has 3,684 disclosures indexed across all operators we track. Geographically, SAKAI SOUKEN Co. is reported in Japan, a country with 89 ransomware disclosures in our corpus.

If your organisation is affected

A listing by hunters means SAKAI SOUKEN Co. 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 hunters'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.