Legilog.fr listed on apt73 leak site with claims of data breach

• Ransomware group: apt73
• Country: France
• Sector: Transportation
• Announcement date: April 27, 2026

Apt73 claims data breach against legilog.fr

The threat group known as apt73 has listed the French technology company legilog.fr on its leak site. The group has made claims regarding a significant data breach involving the organization. According to the announcement made on the group's platform, the attackers allege they have successfully exfiltrated a substantial amount of data from the company's systems.

The threat actor, identified as apt73, claims to have compromised data belonging to the organization's management software systems. This type of activity is often associated with double extortion tactics, where ransomware groups not only encrypt an organization's data to disrupt operations but also steal sensitive information to use as leverage. By threatening to publish stolen data on a public leak site, these actors aim to pressure the victim into paying a ransom to prevent the exposure of confidential information.

The threat to publish the stolen data has been active since October 8, 2024. This indicates a prolonged period of pressure on the organization, as the threat actor has maintained the threat to release the information for a significant amount of time prior to the recent announcement on the leak site.

Details of the alleged data exfiltration

The announcement from apt73 claims the possession of 10 GB of data. The group has provided screenshots as evidence of the breach, which display sample files. These samples reportedly contain various administrative records, including names and surnames, suggesting that the stolen information includes sensitive personal details.

The specific types of data mentioned in the claim include:

• CRM data
• Personal data
• Backup files

The inclusion of CRM systems, export files, and backups in the claim suggests that the attackers may have gained access to core operational databases and historical records. When such data is compromised, it can lead to a wide range of secondary risks, such as identity theft or highly targeted phishing campaigns, as malicious actors can use the stolen personal information to craft convincing fraudulent communications.

Legilog.fr profile

Legilog is a French technology company that develops management software and CRM systems for culture, businesses, religious organizations, and bishoprics.

Potential impact and organizational implications

This alleged breach may pose a risk of exposure for the personal data of legilog.fr's customers and employees. Because the organization operates in France, a confirmed breach could lead to significant legal and administrative consequences under the European Union's General Data Protection Regulation (GDPR). The regulatory framework established by GDPR imposes strict requirements on how personal data must be protected and how breaches must be reported to authorities and affected individuals.

While information regarding the apt73 group remains limited, their ransomware tactics may negatively impact the organization's operational continuity and reputation. The disruption caused by such attacks can affect the ability of a company to provide its services reliably, potentially damaging the trust established with clients and partners.

In general, organizations facing such threats often focus on defensive measures such as implementing robust multi-factor authentication, maintaining offline backups, and conducting regular security awareness training for employees. Monitoring for unauthorized access and ensuring timely detection of exfiltration attempts are also critical components of a modern cybersecurity posture. For companies handling sensitive CRM and personal data, maintaining compliance with regional data protection laws is essential to mitigate both legal and reputational damage following a potential incident.