Was Advanced Connection Corporation hit by ransomware?

Advanced Connection Corporation was listed by the thegentlemen 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 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 Advanced Connection Corporation breach?

thegentlemen published data attributed to Advanced Connection Corporation. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Advanced Connection Corporation Public Company Limited (บริษัท แอดวานซ์ คอนเนคชั่น คอร์ปอเรชั่น จำกัด (มหาชน))

listed as Advanced Connection Corporation · Claimed by Thegentlemen · listed 4 months ago

Age

since listed · data leaked

Status timeline

ListedFeb 25, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: Japan
Listed on leak site: Feb 25, 2026

About the victim

AI dossier — public-source company profile

Advanced Connection Corporation Public Company Limited (ACC) is a Thai publicly listed holding company traded on the Thai stock exchange (ticker: ACC, 0.37 THB). The company operates two primary business units: a renewable energy division (solar rooftop, solar farm, and EPC projects, active since 2015) and a financial/capital business unit. It is incorporated in Thailand and focuses on sustainable investment growth under good corporate governance.

Industry: Renewable Energy & Investment Holding
Founded: 2015

Attack summary

Severity: medium — Data is marked as published, suggesting exfiltration and release occurred; however, the leak post content is entirely blocked by a verification wall, leaving no verifiable detail on data type, volume, or sensitivity. No ransom amount, data size, or specific data categories are available, and the company is a small-cap Thai public holding company without an obvious critical-infrastructure designation.

The ransomware group 'thegentlemen' claims an attack on Advanced Connection Corporation with a disclosed status of 'data_published', indicating data has been released. The leak post itself is inaccessible due to a bot-verification page, so specific details on encryption or exfiltration scope cannot be confirmed from the post content.

medium

What the group claims

acc-plc.com zoominfo.com/c/advanced-connection-corporation-public-company-ltd/444966064 Advanced Connection Corporation Public Company Limited helps businesses connect and communicate better. They provide networking technologies and communication services that make it easier for companies to stay in touch. Their team works with clients across different industries to create reliable communication systems and technology solutions

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 siteacc-plc.com
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 25, 2026Advanced Connection Corporation 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

Geographically, Advanced Connection Corporation is reported in Japan, a country with 108 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Advanced Connection 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.
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.