Yapi Teknik Proje listed on Qilin ransomware leak site

• Ransomware group: Qilin
• Country: Türkiye
• Sector: Manufacturing
• Announcement date: July 28, 2025

Qilin ransomware group claims data breach at Yapi Teknik Proje

The Qilin ransomware group has listed the Turkish manufacturing firm Yapi Teknik Proje on its dedicated leak site. According to the announcement made by the threat actors, the organization's data has been compromised during a cyberattack.

The claim regarding the breach was officially announced on the group's leak site on July 28, 2025. The threat actors allege that they successfully gained unauthorized access to the company's internal systems on July 16, 2025. This timeline suggests that the attackers maintained a presence within the network for approximately twelve days prior to the public announcement of the theft.

Details of the alleged data compromise

While the group has publicized the attack, the specific volume of the stolen data and the exact number of files involved remain unknown, as no information was provided regarding the data size or file count. Furthermore, there is no information available regarding a specific ransom demand.

The group's announcement includes screenshots that appear to show various tables and document samples. These materials are assessed to be related to the operational activities of the company. Specifically, it is alleged that data related to the following areas has been compromised:

• Static design operations
• Project planning operations

Despite the presence of these visual samples, the full scope and specific contents of the leaked data have not been explicitly detailed by the attackers.

About Yapi Teknik Proje

Yapi Teknik Proje is an established engineering firm based in Istanbul, Turkey, with operations dating back to 1988. The company specializes in the static design, project planning, and implementation of various structural types, including reinforced concrete, steel, and timber structures. Their engineering services are provided for a variety of projects on both a national and international scale.

Analysis and potential implications

The Qilin group is known to employ double-extortion tactics. In such scenarios, threat actors not only encrypt an organization's data to disrupt operations but also steal sensitive information to use as leverage. This tactic creates a situation where, if a ransom is not paid, the stolen data is released publicly or sold to other malicious actors, potentially causing significant reputational and operational damage.

Because Yapi Teknik Proje operates within Turkey, this incident may trigger specific legal obligations. The exposure of corporate data can necessitate formal notifications under the KVKK (Personal Data Protection Law). Beyond legal compliance, the breach carries significant risks for the organization's business integrity. The exposure of sensitive information could lead to the disclosure of trade secrets and could potentially weaken the security of the broader supply chain.

Furthermore, the leaked information could be weaponized by attackers to launch targeted phishing campaigns against the company's employees or its various business partners. Such attacks often use stolen context to appear legitimate, increasing the likelihood of further successful compromises.

In the manufacturing and engineering sectors, maintaining robust cybersecurity posture is critical. Organizations can mitigate these risks by implementing strict access controls, maintaining offline backups, and conducting regular security awareness training for employees to recognize phishing attempts. Given that public information regarding the Qilin group remains limited, organizations should remain vigilant against their evolving methodologies.