CIE listed on Fog ransomware leak site

• Ransomware group: Fog
• Country: Czechia
• Sector: Technology
• Announcement date: March 6, 2025

Fog ransomware group claims data breach at CIE

The threat actor known as Fog has listed data allegedly belonging to the Czech-based technology company CIE on its dedicated leak site. According to the announcement, the threat actor claims to have exfiltrated a significant volume of information from the organization's internal systems. This incident follows a pattern often seen in modern cyberattacks where threat actors use public leak sites to pressure organizations through the threat of data exposure.

The announcement was officially posted on the leak site on March 6, 2025. While the listing was made public in March, the threat actor claims the actual attack occurred much earlier, specifically on February 1, 2025. Information regarding the Fog group remains limited in the public domain, making it difficult to ascertain the full scope of their operations or their specific motivations beyond the claims made in this instance.

Details of the alleged GitLab breach

The Fog group has categorized this specific breach within a broader list on their platform titled "The 19 biggest gitlabs." The threat actor claims that the stolen data was obtained directly from the organization's GitLab infrastructure. This suggests that the attackers targeted the version control and collaborative development environment used by the company to manage its software projects.

The volume of the alleged data theft is substantial, with the group claiming to have extracted 218 GB of information. The specific file count and the exact ransom demand associated with this incident have not been disclosed by the group. The data allegedly compromised during this event includes:

• Source code
• Software development data

About CIE

CIE Group is a technology company headquartered in the Czech Republic. The organization specializes in software development, system integration, and IT consulting. Their professional focus is primarily directed toward enterprise software solutions and various digital transformation projects for their clients.

Potential impact and industry implications

The nature of the data allegedly leaked, which includes source code and software development data, poses significant risks to the organization. Such a breach could potentially harm the organization's intellectual property and create a foundation for future supply chain attacks, where compromised software components are used to target the company's end users. Because the organization is based in the Czech Republic, the incident may fall under the regulatory oversight of the European Union's General Data Protection Regulation (GDPR).

Furthermore, the scale of the alleged leak increases the risk of targeted phishing attacks or identity theft directed at the organization's customers and partners. In the technology and software development sector, maintaining the integrity of development environments like GitLab is critical to preventing such exposures.

In general, ransomware groups often employ a tactic known as double extortion. In this scenario, attackers not only encrypt an organization's data to disrupt operations but also steal sensitive information to use as leverage. By threatening to release the data on a public leak site, they increase the pressure on the victim to pay the ransom. To defend against such threats, organizations typically implement robust access controls, multi-factor authentication, and continuous monitoring of their development infrastructure. Regular audits of version control systems and strict data loss prevention measures are also standard defensive practices to mitigate the risk of large-scale exfiltration.