PT. Mitra Antar Tangguh listed on Tengu ransomware leak site

• Ransomware group: Tengu
• Country: Indonesia
• Sector: Professional Services
• Announcement date: February 10, 2026

Tengu ransomware group claims breach of PT. Mitra Antar Tangguh

The threat actor known as Tengu has announced the listing of the Indonesia-based organization PT. Mitra Antar Tangguh on its dedicated leak site. This announcement, made on February 10, 2026, suggests that the organization has been targeted in a cyberattack involving data exfiltration.

Ransomware groups often utilize leak sites to pressure victims into paying ransoms. This tactic is frequently associated with double extortion, where attackers not only encrypt an organization's systems but also steal sensitive information, threatening to publish it publicly if their demands are not met. By listing a victim on their site, the group aims to maximize the visibility of the breach and increase the pressure on the targeted entity.

Details of the alleged attack

According to the claims made by the Tengu group, the attackers gained unauthorized access to the digital assets of PT. Mitra Antar Tangguh. The group alleges that this access allowed them to exfiltrate data, which they then intended to leak. While the group has made these claims, information regarding the specific capabilities and history of the Tengu group remains limited in the public domain.

The announcement was made on the same day that the group claims the attack occurred, which is February 10, 2026. At this stage, the incident remains an allegation by the threat actor, and the full extent of the breach has not been independently verified.

Information regarding the leaked data

Despite the listing on the leak site, specific details regarding the volume and nature of the stolen information are currently unavailable. The group has not provided information regarding the total size of the data or the specific file count involved in the breach. Furthermore, no ransom demand has been specified in the public announcement.

In the screenshots provided by the threat actor to support their claim, the file directories appear to be blurred. Consequently, there is no definitive information regarding the exact nature and content of the data that has allegedly been leaked. The listing names no specific data types.

About PT. Mitra Antar Tangguh

PT. Mitra Antar Tangguh is a professional services firm located in Indonesia. The organization operates as a limited liability company within the professional services sector.

Impact and organizational considerations

The claim of a data leak can have significant consequences for an organization. Such incidents may negatively impact the operational continuity of the firm and damage its commercial reputation. Because the content of the shared data has not been clarified, the risk that personal data or sensitive corporate information has been exposed cannot be ignored.

Organizations facing such threats may face various challenges, including:

• Legal and regulatory obligations: Depending on the jurisdiction, such as under the data protection regulations in Indonesia, the organization may have legal duties to report the breach and notify affected parties.
• Secondary attacks: There is a possibility that any leaked data could be utilized by malicious actors in subsequent, targeted phishing campaigns or other secondary attacks.
• Reputational damage: The public nature of leak sites can erode trust with clients and business partners.

To address such incidents, it is often advisable for an organization to initiate a comprehensive forensic investigation. Such an investigation is necessary to determine the true scope of the breach and to understand exactly what information was accessed or exfiltrated by the threat actor.