Iliad.fr listed on ALP-001 leak site following alleged data breach

• Ransomware group: ALP-001
• Country: France
• Sector: Technology
• Announcement date: March 30, 2026

ALP-001 claims data breach against iliad.fr

The threat actor group known as ALP-001 has officially listed the French telecommunications company iliad.fr on its leak site. Through this announcement, the group claims to have successfully compromised the organization's data. This development follows a pattern often seen in modern cyberattacks where threat actors use public leak sites to pressure victims by threatening the release of stolen information.

According to the announcement made on March 30, 2026, the ALP-001 group alleges that a significant dataset containing the company's network engineering data has been exfiltrated. The group has reportedly provided sample files for download to demonstrate the validity of their claims. Furthermore, the threat actor has established a deadline of April 11, 2026, regarding the situation. While the group has made these allegations, the specific details regarding the total volume of data or the specific ransom demand have not been disclosed in the public announcement.

Details of the allegedly compromised data

The information allegedly stolen by ALP-001 is highly technical and pertains to the core operational and engineering aspects of the telecommunications network. The group claims that the breach involves a wide array of sensitive technical documentation and measurements essential for maintaining network integrity and service quality.

The specific types of data mentioned in the claim include:

• Network engineering data
• Radio measurement data
• GPS location data
• Signal strength logs

In addition to these categories, the announcement specifies that the leaked content may encompass radio measurements, GPS drive tests, calibration and optimization data, and regulatory reports. The dataset is also said to contain network design information, signal strength logs such as RSRP, RSSI, and SINR, as well as 3G/4G/LTE measurements. Other items mentioned include speed and latency tests, zone projects, and city-specific projects.

About iliad.fr

Iliad is a France-based telecommunications company. The organization provides a variety of essential services, including broadband internet, fixed-line telephony, and various retail telecommunication services to its customer base.

Security implications and industry context

This incident suggests that critical telecommunications infrastructure data belonging to iliad.fr may be at risk of exposure. The technical nature of the data allegedly compromised—ranging from signal strength logs to network design information—could potentially be utilized for secondary attacks targeting the company's network security and operational continuity. Such a breach poses significant risks to both customer privacy and the security of national infrastructure.

Because the company is based in France, this incident may lead to legal and administrative sanctions under the European Union's General Data Protection Regulation (GDPR). In the telecommunications sector, the exposure of technical engineering data is particularly sensitive as it provides a roadmap of the network architecture.

While public information regarding the ALP-001 group remains limited, this event highlights the ongoing risks faced by the technology and telecommunications sectors. Ransomware groups often employ double extortion tactics, where they not only encrypt systems but also steal data to threaten its public release. To defend against such threats, organizations in this sector typically focus on robust network segmentation, continuous monitoring of data exfiltration, and strict access controls for sensitive engineering documentation. Strengthening incident response plans and ensuring compliance with regional data protection regulations are also vital components of a modern cybersecurity posture.