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, 2026Keretapi Tanah listed by thegentlemenon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Transportation/Logistics sector, which has 847 disclosures indexed across all operators we track. Geographically, Keretapi Tanah is reported in MY, a country with 29 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

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Keretapi Tanah

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: MY
Sector: Transportation/Logistics
Listed on leak site: May 6, 2026

About the victim

AI dossier — public-source company profile

Keretapi Tanah Melayu Berhad (KTMB) is Malaysia's largest and oldest national railway operator, managing a rail network of approximately 1,699 km across Peninsular Malaysia with connections into Singapore and Thailand. The company operates KTM Komuter urban commuter services, ETS electric intercity trains, KTM Intercity diesel trains, and KTM Kargo freight services. Privatised in 1992, KTMB serves millions of passengers annually through physical stations, an online ticketing portal, and a mobile app with QR-code boarding.

Industry: National Railway Transportation
Address: Jalan Sultan Hishamuddin, 50621 Kuala Lumpur, Malaysia
Employees: 5001-10000
Founded: 1885

Attack summary

Severity: high — KTMB is a national critical transportation infrastructure operator serving millions of passengers; confirmed data publication by a ransomware group against a state-linked railway authority constitutes a significant breach of critical infrastructure, even without explicit enumeration of data types, warranting a high severity classification.

The group 'thegentlemen' has published data belonging to KTMB, indicating exfiltration and disclosure of company data. No ransom amount was stated and no specific data categories or volume were detailed in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Undisclosed exfiltrated company data

What the group claims

ktmb.com.my zoominfo.com/c/keretapi-tanah-melayu-berhad/21365008 KTMB (Keretapi Tanah Melayu Berhad) is Malaysia's largest and oldest railway company, with a rail network spanning 1,699 km across Peninsular Malaysia, extending into Singapore and Thailand. It operates multiple services including KTM Komuter (urban commuter trains since 1995), ETS electric intercity trains, and diesel-powered KTM Intercity trains. The company was privatized in 1992 and today offers online ticketing via its website and mobile app, with a QR-code boarding system

Sources

Victim sitektmb.com.my

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.