Was Yapı Merkezi hit by ransomware?

Yapı Merkezi was listed by the thegentlemen ransomware operation (Turkey), 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 Yapı Merkezi breach?

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

Ransomware victim disclosure

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Yapı Merkezi

Claimed by Thegentlemen · listed 5 days ago

Age

since listed · data leaked

Status timeline

ListedSep 7, 2026
Data leakeddate unknown

At a glance

Group: Thegentlemen
Status: Data leaked
Country: Turkey
Sector: Manufacturing
Listed on leak site: Sep 7, 2026

About the victim

AI dossier — public-source company profile

Yapı Merkezi Holding is a Turkish construction and engineering conglomerate founded in 1965, headquartered in Istanbul. The group operates across general contracting, rail systems, pipe manufacturing, prefabrication, real estate development, and restoration, with a global presence spanning offices in Africa, the Middle East, Europe, and Asia. It ranked 113th on ENR's 2026 International Contractors Top 250 list.

Industry: Heavy Construction & Infrastructure Engineering
Address: Burhaniye Mh. Hacı Reşit Paşa Sokak No: 4 Üsküdar 34676 İstanbul, Türkiye
Employees: 110
Founded: 1965

Attack summary

Severity: low — No proof files, screenshots, or specific data inventory are advertised in the leak post. No operational impact is stated. The disclosure is a bare listing without supporting evidence of data exfiltration or encryption.

The ransomware group 'thegentlemen' claims to have accessed Yapı Merkezi's systems and published data. The leak post does not specify what data was exfiltrated, whether encryption occurred, or the scope of the breach.

low

What the group claims

ym.com.tr rocketreach.co/yapi-merkezi-profile_b5c7f2fff42e0db7 YM Group is a Turkish family-owned manufacturing and brand house founded in 1986 in Istanbul by Yüksel Mehmet Yıldırım, built on a flexible-packaging plant in Çorlu (Halal-certified, exporting to Europe/MENA). Its crown jewel: it owns and operates the legendary American trail-running brand Ultimate Direction (the 1935 inventor of the hydration pack) — designing, manufacturing in Turkey and distributing it worldwide — plus its own jewelry line Ela by YM and investment arm YM Capital. The group follows the classic ladder: manufacturing → own brands → capital, with Halal certification as a niche edge for Gulf/Asian markets. Small core team (~110), private, low-profile, no public financials. Bottom line: a quiet Turkish industrial family that turned commodity packaging profits into ownership of an iconic American outdoor brand.

Sources

Victim siteym.com.tr

Source

Indexed 5 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 838 public disclosures across our corpus. First observed on a leak site on September 9, 2025; most recent post September 9, 2026. The operation is currently active.

Also tracked as: the gentlemen.

Timeline of this disclosure

September 7, 2026Yapı Merkezi listed by thegentlemen on the group's public leak site

Other recent disclosures by thegentlemen

thegentlemen has been linked to 838 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 Manufacturing sector, which has 3,696 disclosures indexed across all operators we track. Geographically, Yapı Merkezi is reported in Turkey, a country with 31 ransomware disclosures in our corpus.

If your organisation is affected

A listing by thegentlemen means Yapı Merkezi 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.