Was GCA Professional hit by ransomware?

GCA Professional was listed by the thegentlemen ransomware operation (Hong Kong SAR China), 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 GCA Professional breach?

thegentlemen published data attributed to GCA Professional. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

← All victims

GCA Professional Services Group Ltd

listed as GCA Professional · Claimed by Thegentlemen · listed 2 months ago

Age

since listed · data leaked

Status timeline

ListedApr 4, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: Hong Kong SAR China
Sector: Business Services
Listed on leak site: Apr 4, 2026

About the victim

AI dossier — public-source company profile

GCA Professional Services Group Ltd is a leading financial services provider headquartered in Hong Kong with over 25 years of experience. The firm serves blue-chip institutional, corporate, and individual clients globally. Its core services include valuation and advisory, corporate finance, mining and mineral consultancy, and corporate services.

Industry: Financial & Professional Advisory Services
Address: Hong Kong

Attack summary

Severity: high — Data has been confirmed as published ('data_published' status) from a financial services firm handling sensitive institutional and corporate client data, including financial advisory and corporate finance records, which constitutes significant business and potentially regulated data exposure.

The group 'thegentlemen' claims to have compromised GCA Professional Services Group Ltd and has published data from the attack. The disclosed status indicates data has been published, though no specific data volume or ransom demand was stated in the post.

high

Data the group says was taken

AI dossier — extracted from the leak post

Financial advisory records
Corporate finance documents
Valuation and advisory files
Mining and mineral consultancy data
Client records (institutional, corporate, individual)
Corporate services documentation

What the group claims

gca-group.com zoominfo.com/c/gca-professional-services-group-ltd/346680381 GCA Professional Services Group is a leading financial services provider headquartered in Hong Kong, with over 25 years of experience serving blue-chip institutional, corporate, and individual clients globally. Its core services include valuation and advisory, corporate finance, mining and mineral consultancy, and corporate services.

Sources

Victim sitegca-group.com

Source

Indexed 2 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.

Is this your supplier? Your competitor? You?

Pro plans monitor your domain, corporate emails, and crypto wallets across every new ransomware leak-site post, breach dump and Telegram callout — alerts within 5 minutes.

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

April 4, 2026GCA Professional 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 Business Services sector, which has 2,643 disclosures indexed across all operators we track. Geographically, GCA Professional is reported in Hong Kong SAR China, a country with 23 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means GCA Professional 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.