Disclosure context

About thegentlemen

thegentlemen is a ransomware group that emerged in September 2025, operating with apparent financial motivations based on their broad targeting of commercial sectors. The group has documented 267 victims across multiple countries, with primary focus on the United States, Thailand, France, Brazil, and India. Their targeting strategy demonstrates a preference for high-value sectors including manufacturing, technology, healthcare, and financial services organizations. Given the group's recent emergence and limited public documentation from established threat intelligence sources such as CISA, FBI, or major security research firms, specific details regarding their country of origin, operational structure, attack methodologies, encryption techniques, and whether they employ ransomware-as-a-service models remain unclear. The relatively high victim count of 267 in a short operational timeframe since September 2025 suggests either an aggressive campaign pace or potential inflation of victim numbers through affiliate operations, though without corroborating intelligence reports, the group's exact operational capabilities and notable campaigns cannot be definitively established. Current intelligence indicates the group remains active as of late 2025, though comprehensive threat profiling requires additional validated reporting from authoritative cybersecurity sources. The group has been linked to 424 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post May 18, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

May 6, 2026East listed by thegentlemenon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Not Found sector, which has 4,859 disclosures indexed across all operators we track. Geographically, East is reported in JP, a country with 88 ransomware disclosures in our corpus.

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.

Ransomware victim disclosure

← All victims

East

Claimed by thegentlemen · listed 15 days ago

14d

Age

since listed · data leaked

Status timeline

Listed
May 6, 2026
Data leaked

At a glance

Group: thegentlemen
Status: Data leaked
Country: JP
Sector: Not Found
Listed on leak site: May 6, 2026

About the victim

AI dossier — public-source company profile

East Inc. (株式会社イースト) is a Tokyo-based Japanese company specialising in comprehensive outsourcing and management services for commercial facilities including shopping malls, outlet parks, and office complexes. The company provides system development (notably MallPro tenant management and Alys analytics platforms), operations management, sales promotion, and regional revitalisation services, with a track record covering over 800 facilities nationwide. Clients include major properties such as Roppongi Hills, Nihonbashi Takashimaya S.C., and Mitsui Outlet Parks; since 2007 it has also supported Japanese firms expanding into China.

Industry: Commercial Facility Outsourcing & Management Services
Address: Tokyo, Japan

Attack summary

Severity: high — Data has been published (disclosed_status: data_published) following confirmed unauthorised access to the internal network of a company handling sensitive operational and client data for hundreds of major commercial facilities across Japan. The breadth of client relationships and potential exposure of tenant, operational, and business data warrants a high severity rating, though the absence of confirmed PII-at-scale or regulated data prevents a critical classification.

The group 'thegentlemen' claims to have conducted an attack against East Inc., with the status recorded as 'data_published', indicating exfiltration and publication of company data. East Inc.'s own website confirmed on 2026-05-07 that unauthorised third-party access to its internal network was detected on 24 April 2026, though the company stated it had not at that point confirmed external data leakage.

high

Data the group says was taken

AI dossier — extracted from the leak post

Internal network data
Business operational data
Client/tenant management records
Company system data

What the group claims

east-inc.jp zoominfo.com/c/east/5000054099 East Inc. is a Japanese company headquartered in Tokyo that provides comprehensive outsourcing services for commercial facilities — shopping malls, outlet parks, and office complexes — covering everything from day-to-day operations to system development, website management, and information services. The company has an impressive track record of over 800 commercial facilities nationwide across Japan, with clients including Roppongi Hills, Nihonbashi Takashimaya S.C., Mitsui Outlet Parks, and Ebisu Garden Place. Since 2007, East Inc. has also been supporting Japanese companies expanding into China, offering systems and operational know-how for overseas operations

Sources

Victim siteeast-inc.jp

Source

Indexed 15 days 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.