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

Sector and geography

This disclosure adds to ransomware activity in the Business Services sector, which has 2,640 disclosures indexed across all operators we track. Geographically, MIMS is reported in SG, a country with 33 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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MIMS

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: SG
Sector: Business Services
Listed on leak site: May 6, 2026

About the victim

AI dossier — public-source company profile

MIMS is a pharmaceutical prescribing reference platform originally published in the United Kingdom in 1959 by Haymarket Media Group. It provides comprehensive drug information — including dosages, interactions, clinical guidelines, and prescribing data — to healthcare professionals across Asia, Australia, and beyond, with dedicated country editions for Malaysia, India, Indonesia, Japan, Singapore, and others. Its mobile app and online database are used daily by doctors and pharmacists for drug lookups, medical news, and continuing medical education (CME) content.

Industry: Pharmaceutical & Medical Information Services
Address: Singapore (registered as MIMS Pte Ltd; specific street address not stated in available sources)
Founded: 1959

Attack summary

Severity: high — MIMS serves healthcare professionals with sensitive medical and prescribing data; the platform holds user account data including professional credentials and emails for doctors and pharmacists across multiple Asian countries. Data has been confirmed published by the group, indicating exfiltration of data that likely includes PII of healthcare professionals at scale and potentially sensitive clinical/pharmaceutical content, warranting a high severity rating.

The group 'thegentlemen' claims to have compromised MIMS and has published data ('data_published' status), though no specific ransom amount or data size is stated in the post. The nature of the exfiltrated data has not been explicitly detailed in the truncated leak post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Healthcare professional user records
Drug information database content
Clinical guidelines and prescribing data
CME/CPD course participant data
Account credentials (usernames, emails, professions)
Internal business documents

What the group claims

mims.com zoominfo.com/c/mims-pte-ltd/354424916 MIMS is a pharmaceutical prescribing reference guide first published in the United Kingdom in 1959 by Haymarket Media Group. The platform provides comprehensive drug information — including dosages, interactions, clinical guidelines, and prescribing data — for healthcare professionals across the globe. MIMS operates internationally across Asia, Australia, and beyond, with dedicated editions for countries including Malaysia, India, Indonesia, Japan, Singapore, and many others. Its mobile app and online database are used daily by doctors and pharmacists for drug lookups, medical news, and CME articles

Sources

Victim sitemims.com

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.