Was Mandom Corporation hit by ransomware?

Mandom Corporation was listed by the worldleaks 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 worldleaks ransomware group?

worldleaks 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 Mandom Corporation breach?

worldleaks published data attributed to Mandom Corporation. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

Mandom Corporation

Claimed by Worldleaks · listed 9 months ago

Age

since listed · data leaked

Status timeline

ListedOct 11, 2025
Data leakeddate unknown

At a glance

Group: Worldleaks
Status: Data leaked
Country: Japan
Sector: Consumer Services
Listed on leak site: Oct 11, 2025

About the victim

AI dossier — public-source company profile

Mandom Corporation is a Japanese personal care and cosmetics company founded in 1927 and headquartered in Osaka, Japan. It manufactures and sells cosmetics, hair care, and health products under well-known brands including Gatsby and Lucido-L, with a strong focus on the men's grooming market. The company operates domestically and across Asia through a network of group companies.

Industry: Personal Care Products & Cosmetics
Address: Osaka, Japan
Employees: 1001-5000
Founded: 1927

Attack summary

Severity: high — Data is marked as published (data_published), confirming exfiltration and release of data from a publicly listed multinational corporation; while the specific data types are not enumerated, a confirmed data publication from a company of this scale with investor, employee, and operational data represents a high-severity incident.

The worldleaks group claims to have published data belonging to Mandom Corporation, with the disclosure status marked as data_published, indicating exfiltration and subsequent release of company data. No specific ransom amount or data volume was stated in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Corporate business data
Potentially employee records
Potentially financial or IR-related documents

Original description

AI-summarised, not from the leak post

Mandom Corporation is a Japanese company specializing in the production and sale of cosmetics, perfume, and health products. Originated in Osaka, it offers leading brands like Gatsby and Lucido-L. With a focus on personal care products for men, Mandom also caters to women's beauty needs. This firm is recognized for creating innovative, high-quality products that promote comfort and style.

Sources

Victim sitemandom.co.jp
Leak posthttps://worldleaksartrjm3c6vasllvgacbi5u3mgzkluehrzhk2jz4taufuid.onion/companies/8160043050

Source

Indexed 9 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.

Is this your supplier? Your competitor? You?

Pro plans monitor your domain, corporate emails, and crypto wallets across every new ransomware leak-site post, breach dump and Telegram callout — alerts within 5 minutes.

Disclosure context

About worldleaks

Based on the limited available data, worldleaks is a recently emerged ransomware group that was first observed in May 2025 and appears to be primarily financially motivated, having claimed 134 victims in a relatively short timeframe since its emergence. The group's origin and organizational structure remain unclear, with no publicly documented information from major cybersecurity firms or law enforcement agencies regarding their country of origin, potential affiliations, or operational model. Their targeting patterns indicate a focus on English-speaking countries, particularly the United States, United Kingdom, and Canada, with additional activity observed in Germany and Japan, while their sector targeting shows a preference for healthcare, technology, manufacturing, and consumer services organizations. Due to the group's recent emergence and limited public documentation by established threat intelligence sources, specific details about their attack methodologies, encryption techniques, extortion tactics, and notable campaigns have not yet been comprehensively analyzed or reported by organizations such as CISA, FBI, or major cybersecurity research firms. The group appears to remain active as of the most recent observations, though comprehensive threat intelligence profiling awaits further analysis and documentation by established cybersecurity authorities. The group has been linked to 173 public disclosures across our corpus. First observed on a leak site on May 18, 2025; most recent post July 2, 2026. The operation is currently active.

Timeline of this disclosure

October 11, 2025Mandom Corporation listed by worldleakson the group's public leak site

Other recent disclosures by worldleaks

worldleaks has been linked to 173 public victims on Darkfield. A sample of the most recent:

See the full worldleaks dossier →

Sector and geography

This disclosure adds to ransomware activity in the Consumer Services sector, which has 829 disclosures indexed across all operators we track. Geographically, Mandom Corporation is reported in Japan, a country with 220 ransomware disclosures in our corpus.

If your organisation is affected

A listing by worldleaks means Mandom Corporation 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 worldleaks'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.