LEYHAUSEN Research Listed by qilin Ransomware Group

On October 15, 2025, German market research firm Leyhausen Research GmbH appeared on the leak site of the qilin ransomware group after its internal files were allegedly exfiltrated during a ransomware attack.

What's Publicly Reported from Reporting

Public reporting indicates that Leyhausen Research, founded in 1996 and headquartered in Leverkusen, Germany, provides global field services including state-of-the-art facilities and call centers spanning Europe, the Middle East, India, and Africa. The qilin ransomware group listed the company on its data leak portal, claiming to have stolen internal files. Available reporting describes the exposed material as internal documents, though the precise volume and full list of data types remain unconfirmed by the company. No specific victim count for individuals whose information may have been inside those files has been disclosed.

October 15, 2025 marks the public listing date on the qilin leak site. The attack followed the typical ransomware pattern of initial access, data exfiltration, and subsequent extortion pressure.

Why This Matters for You and Your Family

When a company that conducts surveys, manages call centers, or handles field research is breached, the files taken often contain contact details, survey responses, or customer records that can include names, addresses, phone numbers, email addresses, and other personal information belonging to ordinary people like you. If your family has ever participated in market research studies, focus groups, or responded to calls from European or international research firms, your data may have been stored in systems now compromised.

Internal files exfiltrated means the information may now be in the hands of criminals who can sell it, publish it, or use it to launch further attacks. For many families this translates into a sudden increase in spam, phishing calls, identity theft attempts, or even targeted scams that reference details only a legitimate research firm would know.

The Doxxing and Identity-Chain Implications

Stolen internal files frequently contain more than isolated records. They can link email addresses to phone numbers, physical addresses, survey IDs, and sometimes notes that connect family members. Criminals use these connections to build identity chains that reveal relationships, children’s names, or household details. Once one piece of information surfaces on underground forums, it becomes easier to find linked gaming accounts, social media handles, or school-related records.

Credential leaks like this one cascade into account takeovers. A password or security question exposed in a research company’s files can unlock email, shopping accounts, or online gaming profiles. Children’s gaming accounts are especially vulnerable because they often reuse credentials or recovery information tied to a parent’s email or phone number listed in household survey data.

Qilin’s Publicly Known Track Record

Public reporting attributes the attack to the qilin ransomware group, which emerged in 2022. The group has targeted organizations across multiple sectors, with notable prior victims including healthcare providers, manufacturers, and professional services firms. Its typical playbook involves gaining initial access through phishing or exploited vulnerabilities, exfiltrating sensitive files before encrypting systems, and then pressuring victims with threats to publish the data unless a ransom is paid. Qilin operates a leak site where it posts samples and deadlines, a pattern consistent with its past incidents.

What to do

• Run a DoxxScan to map every link between your emails, phone numbers, addresses, and online handles that may have been exposed in the Leyhausen Research files.
• Rotate any password you used for Leyhausen Research surveys or related services anywhere it has been reused, and switch to 2FA through an authenticator app instead of SMS.
• Enable continuous DoxxScan monitoring across 13.1B+ breach records and 100+ platforms so the next leak exposing you or your family is caught and addressed in hours rather than months.
• Cover the household with DoxxScan family coverage that extends to dependents and children’s gaming accounts, which often chain back to the same contact details now at risk.
• Let remediation specialists handle takedown requests for any personal information that appears on data broker sites or underground forums following this claimed breach.

The incident underscores that even participation in routine market research can expose your family to long-term privacy risks if those organizations suffer ransomware attacks. Starting with a clear picture of where your information surfaces and maintaining active protection is the most practical defense. DoxxScan by GalaxyWarden delivers continuous monitoring across 13.1B+ breach records and 100+ platforms, AI-powered identity-chain mapping, hands-on remediation by specialists, and household coverage that includes children’s gaming accounts. Its specialists can help you close the gaps this claimed breach created before criminals exploit the full chain.