António Belém & António Gonçalve listed on ciphbit ransomware leak site

• Ransomware group: ciphbit
• Country: Portugal
• Sector: Professional Services
• Announcement date: September 24, 2025

António Belém & António Gonçalve targeted by ciphbit ransomware group

The ransomware group known as ciphbit has listed the Portuguese professional services firm António Belém & António Gonçalve on its dedicated leak site. The announcement, which appeared on September 24, 2025, indicates that the threat actor claims to have successfully obtained data belonging to the organization. This development follows a pattern often seen in modern cyberattacks where groups use public platforms to pressure victims.

Details of the alleged attack

According to the announcement made on the ciphbit leak site, the threat actor claims to have completed the attack on September 24, 2025. The listing serves as a public claim of a successful breach, though the specific details regarding the organization's internal operations or the exact nature of the alleged leaked data have not been provided by the group. In many ransomware scenarios, groups utilize double extortion tactics, where they not only encrypt an organization's systems but also steal sensitive information to use as leverage during negotiations. By posting a victim's name on a leak site, the group aims to increase public pressure on the target to meet their demands.

Information regarding the leaked data

At this stage, the listing does not provide specific details regarding the content of the alleged breach. The announcement does not include any information regarding the volume of data taken or the total number of files involved. Furthermore, the leak site has not provided any screenshots or detailed descriptions regarding the nature of the data. The listing names no specific data types.

About António Belém & António Gonçalve

António Belém & António Gonçalves is a certified accounting and auditing firm based in Portugal. The company provides a range of professional services to its corporate clients, including accounting, tax consulting, and auditing services. As a firm handling sensitive financial and corporate information, organizations in this sector are often considered high-value targets for threat actors seeking to exploit sensitive data.

Implications and potential risks

This incident may indicate that the organization's digital assets have been subject to unauthorized access. Because the content of the alleged leaked data remains unclear, the specific risks—such as the potential exposure of personal information or trade secrets—cannot be determined at this stage. Given that the organization is based in Portugal, any confirmed data breaches may lead to legal consequences under the EU General Data Protection Regulation (GDPR), which imposes strict requirements on how personal data must be protected and reported.

The difficulty in analyzing this specific case is compounded by the fact that public information regarding the ciphbit group is limited. This lack of transparency makes it difficult to fully understand the group's specific methods, technical capabilities, or underlying motivations. For organizations facing similar threats, common defensive steps include maintaining robust backup strategies, implementing multi-factor authentication, and conducting regular security awareness training for employees.

Furthermore, when a breach is claimed, organizations may need to take precautions against secondary risks. These risks include identity theft or targeted phishing attacks, where attackers use stolen information to impersonate employees or clients to gain further access to systems or funds. Maintaining a proactive security posture is essential for mitigating the impact of such incidents.