Was [EVIDENCE PACK 3]ASKUL hit by ransomware?

[EVIDENCE PACK 3]ASKUL was listed by the Ransomhouse 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 Ransomhouse ransomware group?

Ransomhouse 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 [EVIDENCE PACK 3]ASKUL breach?

Ransomhouse published data attributed to [EVIDENCE PACK 3]ASKUL (~743 GB). Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

ASKUL Corporation

listed as [EVIDENCE PACK 3]ASKUL · Claimed by Ransomhouse · listed 7 months ago

743 GB

Data size

$740

Ransom

demanded

Age

since listed · data leaked

Status timeline

ListedDec 2, 2025
Data leakeddate unknown

At a glance

Group: Ransomhouse
Status: Data leaked
Country: Japan
Sector: Business Services
Listed on leak site: Dec 2, 2025
Data size: 743 GB
Ransom demanded: $740

About the victim

AI dossier — public-source company profile

ASKUL Corporation is a Japanese B2B e-commerce company headquartered in Koto-ku, Tokyo, specialising in next-day delivery of office supplies, medical/care products, workplace safety equipment, industrial materials, and consumer goods to small and medium-sized businesses across Japan. Operating primarily through its askul.co.jp platform, ASKUL serves corporate customers with an extensive catalogue spanning stationery, IT peripherals, furniture, food and beverage, and hygiene products. The company is publicly listed and is a well-known major player in Japan's B2B online distribution sector.

Industry: B2B E-Commerce / Office & Industrial Supplies Distribution
Address: 東京都江東区 (Koto-ku, Tokyo, Japan, 〒135-0061)
Employees: 3000
Founded: 1993

Attack summary

Severity: critical — 743 GB of data has been published (data_published status), indicating confirmed large-scale exfiltration from a major Japanese B2B e-commerce platform with millions of corporate customers. The data likely includes significant volumes of customer PII, business financial records, and order history at scale, meeting the critical threshold for confirmed exfiltration of regulated/sensitive data at scale.

Ransomhouse claims to have exfiltrated approximately 743 GB of data from ASKUL and has published it (disclosed_status: data_published); the ransom figure stated is $740, likely a symbolic or placeholder amount. The group has apparently both encrypted systems and exfiltrated corporate data.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Corporate business data
Customer order records
Internal operational files
Potentially employee PII
Potentially customer PII (B2B account data)
Financial records

What the group claims

ASKUL Corporation, founded in 1963 and headquartered in Tokyo, is a leading Japanese e-commerce company serving both businesses (B2B) and consumers (B2C). It offers office supplies, daily goods, medical products, and logistics services through platforms such as ASKUL, SOLOEL ARENA, and LOHACO. The company operates its own distribution centers, ensuring fast delivery and efficient supply chain management. ASKUL also provides additional services like printing, office design, and digital business solutions. The company emphasizes sustainability, digital transformation, and recycling initiatives.

The leak post

captured from the group's site

```
{"data":[{"id":"a1894b76b7004c75a3a0845799af49956592e3d9","display":"animated","header":"HOT NEWS","info":" Trellix is a global cybersecurity company.","url":"","sort":1,"views":"436242"},{"id":"336b257f582b17573c97578efd4b22762bf77344","sort":2,"header":"Trellix (McAfee & FireEye)","url":"https://www.trellix.com/","private":"false","revenue":"1.5-2 B$","employees":"5000","info":"Trellix is a global cybersecurity company formed from the October 2021 merger of McAfee Enterprise and FireEye. It provides services to over 50,000 business and government customers worldwide, protecting more than 200 million endpoints. The companys open and native extended detection and response (XDR) platform helps organizations confronted by todays most advanced threats gain confidence in the protection and resilience of their operations. Trellix, along with an extensive partner ecosystem, accelerates technology innovation through machine learning and automation to empower over 40,000 business and government customers with living security","statusDate":"DEPENDS ON YOU","status":"EVIDENCE","published":"NOT YET","action":"Encrypted","actionDate":"17/04/2026","volume":"~","content":"cybersecurity.html"…

Sources

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 Ransomhouse

Ransomhouse is a ransomware group that emerged in June 2021, operating primarily for financial gain through extortion campaigns targeting organizations across multiple sectors globally. The group's origin and specific affiliations remain unclear based on publicly available intelligence, though their operational patterns suggest they function as an independent cybercriminal organization rather than a traditional ransomware-as-a-service model. Ransomhouse employs double extortion tactics, stealing sensitive data before deploying their ransomware payload and threatening to publish the information on their leak site if victims refuse to pay the demanded ransom. The group has demonstrated a broad targeting approach, with documented attacks against 187 victims primarily concentrated in the United States, China, United Kingdom, Italy, and Spain, focusing heavily on healthcare, technology, business services, and manufacturing sectors. While specific high-profile campaigns have not been extensively documented by major security firms, the group's consistent victim count and geographic distribution indicate sustained operational capability since their emergence. As of current reporting, Ransomhouse remains active with no known major law enforcement disruptions or confirmed rebranding efforts. The group has been linked to 210 public disclosures across our corpus. First observed on a leak site on June 1, 2021; most recent post June 29, 2026. The operation is currently active.

Also tracked as: RANSOM HOUSE.

Timeline of this disclosure

December 2, 2025[EVIDENCE PACK 3]ASKUL listed by Ransomhouseon the group's public leak site

Data size: 743 GB
Ransom demanded: $740

Sector and geography

This disclosure adds to ransomware activity in the Business Services sector, which has 3,796 disclosures indexed across all operators we track. Geographically, [EVIDENCE PACK 3]ASKUL is reported in Japan, a country with 220 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Ransomhouse means [EVIDENCE PACK 3]ASKUL 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 Ransomhouse'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.