Was Sasin Colleges & Universities hit by ransomware?

Sasin Colleges & Universities was listed by the thegentlemen ransomware operation (Thailand), 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 thegentlemen ransomware group?

thegentlemen 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 Sasin Colleges & Universities breach?

thegentlemen published data attributed to Sasin Colleges & Universities. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Sasin School of Management (Sasin Graduate Institute of Business Administration of Chulalongkorn University)

listed as Sasin Colleges & Universities · Claimed by Thegentlemen · listed 4 months ago

Age

since listed · data leaked

Status timeline

ListedFeb 21, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: Thailand
Sector: Education
Listed on leak site: Feb 21, 2026

About the victim

AI dossier — public-source company profile

Sasin School of Management is the graduate business school of Chulalongkorn University, located in Bangkok, Thailand. Established in 1982, it is the first AACSB and EQUIS dual-accredited business school in Thailand, offering programs including MBA, Executive MBA, DBA, and a new Master of Science in Management (MiM). It positions itself as a leading global management school in Southeast Asia.

Industry: Higher Education – Business & Management Schools
Address: Chulalongkorn University, Bangkok, Thailand
Founded: 1982

Attack summary

Severity: medium — Status is listed as 'data_published', indicating claimed exfiltration has occurred at an educational institution that holds student, faculty, and administrative PII; however, the leak post content is entirely inaccessible and no data inventory, volume, or specific proof is verifiable, preventing a higher severity classification.

The group 'thegentlemen' claims to have published data belonging to Sasin School of Management, with the disclosure status listed as 'data_published'; however, the leak post itself is inaccessible (blocked by a bot-verification page), and no specific details on the nature of exfiltrated data, volume, or encryption activity are available from the post.

medium

What the group claims

sasin.edu zoominfo.com/c/sasin/430263326 Sasin School of Management is the first internationally accredited business school in Thailand, established in 1982. It offers a range of programs including MBA, Executive MBA, DBA, and custom executive education aimed at shaping leaders for tomorrow's world. The school targets experienced professionals and aspiring leaders seeking to enhance their management skills and knowledge. Sasin is committed to inspiring, connecting, and transforming individuals for a better, smarter, and sustainable world

The leak post

captured from the group's site

Gentlecloud Protection 🛡️ Gentlecloud Verifying your browser... Initializing security checks... I'm not a bot

Sources

Victim sitesasin.edu
Leak posthttp://tezwsse5czllksjb7cwp65rvnk4oobmzti2znn42i43bjdfd2prqqkad.onion

Source

Indexed 4 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 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 483 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post June 11, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

February 21, 2026Sasin Colleges & Universities listed by thegentlemenon the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 483 public victims on Darkfield. A sample of the most recent:

See the full thegentlemen dossier →

Sector and geography

This disclosure adds to ransomware activity in the Education sector, which has 694 disclosures indexed across all operators we track. Geographically, Sasin Colleges & Universities is reported in Thailand, a country with 45 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Sasin Colleges & Universities 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.
Monitor for the data appearing on thegentlemen'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.