Was Corswarem Group hit by ransomware?

Corswarem Group was listed by the thegentlemen ransomware operation (Belgium), 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 Corswarem Group breach?

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

Ransomware victim disclosure

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Corswarem Group

Claimed by Thegentlemen · listed 10 days ago

10d

Age

since listed · data leaked

Status timeline

ListedSep 30, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: Belgium
Listed on leak site: Sep 30, 2026

About the victim

AI dossier — public-source company profile

Corswarem Group is a family-owned Belgian manufacturer and installer of aluminium windows, doors, curtain-wall facades, terraces, and solar panels, founded in 1957 in Tongeren. Operating across five legal entities with approximately 18–20 employees and €18M in assets, the group holds a 30+ year Schüco Premium Partner designation and delivers full turnkey projects for residential and commercial construction.

Industry: Aluminium Building Products & Installation; Solar Energy
Address: Tongeren, Belgium
Employees: 18–20
Founded: 1957

Attack summary

Severity: low — Post contains only listing/announcement with no stated operational impact, no proof files advertised, and no detail on data exfiltration or encryption. Disclosed status is 'data_published' but no data inventory, proof count, or attack summary is provided in the leak text.

The leak post announces data publication by the thegentlemen group but provides no details of what was exfiltrated, encrypted, or the nature of the breach. No attack methodology or data categories are specified.

low

What the group claims

corswarem.eu Corswarem Group (founded 1957, Tongeren, Belgium) is a family-owned manufacturer and installer of aluminium windows, doors, curtain-wall facades, terraces and solar panels, with 65+ years of expertise and 18–20 employees across five legal entities (Ramenconstructie Corswarem NV as the main operating company, plus Alu Design, Window Creations, Solar Solutions and holding Groep ADC BV with €18M in assets). It is a Schüco Premium Partner (30+ years exclusive) and Renson Ambassador, delivering full turnkey projects from design through production to installation — landmark works include BASF Antwerpen, Posthofbrug Berchem (17,000 m² offices), DronePort Brustem, CM Limburg HQ and the first ASE 80 HI DesignLine installation in Belgium. Led by the Corswarem family (Dirk, An, Jolien), the group booked a gross margin of €5.3M at its 2023 peak but saw profit fall 64% in 2025 to €691K amid Belgium's construction slowdown — though equity rose 44% and debt dropped 30%.

Sources

Victim sitecorswarem.eu

Source

Indexed 10 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.

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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 960 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post October 9, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

September 30, 2026Corswarem Group listed by thegentlemen on the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 960 public victims on Darkfield. A sample of the most recent:

See the full thegentlemen dossier →

Sector and geography

Geographically, Corswarem Group is reported in Belgium, a country with 44 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Corswarem Group 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.
Report the incident to your national CERT, CERT.be (Belgium), as required for your jurisdiction.
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.