ransomed ransomware group lists NTT Docomo - Japan 1st Mobile Operator on its leak site

• Ransomware group: ransomed
• Country: Japan
• Sector: Technology
• Announcement date: September 26, 2023

Ransomed group claims attack on NTT Docomo

The threat actor group known as ransomed has listed the Japanese telecommunications giant NTT Docomo on its leak site. According to the announcement published on September 26, 2023, the group claims to have successfully infiltrated the organization's infrastructure and exfiltrated data. This incident follows a pattern often seen in modern cyberattacks, where threat actors target high-value infrastructure to exert maximum pressure on the victim.

The group alleges that the breach occurred on September 26, 2023. Following the claimed exfiltration of information, the threat actors have issued a ransom demand totaling 1,015,000 USD. While the announcement was made public on the group's leak site, the group has not provided specific details or screenshots regarding the nature of the allegedly exfiltrated data.

Details of the alleged data breach

At this stage of the incident, the specific contents of the breach remain unverified. The threat actor group has not released any documentation or visual evidence to substantiate their claims regarding the stolen information. Consequently, the listing names no specific data types or categories of information that were allegedly taken from the organization's systems.

In many ransomware scenarios, groups utilize a technique known as double extortion. In this model, attackers do not merely encrypt a victim's systems to disrupt operations; they also steal sensitive information to use as leverage. By threatening to leak confidential data on public forums or leak sites, the attackers aim to force the organization into paying a ransom to prevent the exposure of sensitive information, which could lead to regulatory penalties or loss of reputation.

About NTT Docomo

NTT Docomo is a leading mobile operator and telecommunications company based in Japan. The company provides a wide range of services, including mobile communications, internet services, and system integration. Given its position as a primary mobile operator in Japan, the organization plays a critical role in the country's telecommunications landscape.

Potential impact and sector risks

The claims made by the ransomed group could create negative impacts on the organization's operational continuity and customer trust. Depending on the nature of the leaked data, legal processes under data protection regulations may be triggered. Furthermore, secondary risks include the possibility that the obtained data could be used for identity theft or targeted phishing attacks against the organization or its users.

Public information regarding the ransomed group remains limited, making it difficult to attribute the attack to a specific known entity with high certainty. However, given the organization's prominent position in the telecommunications sector, a potential data breach of this scale could also affect supply chain security. Vulnerabilities in a major telecommunications provider can create ripple effects throughout the broader digital ecosystem.

To defend against such threats, organizations in the telecommunications and technology sectors typically focus on several defensive pillars. These include implementing robust identity and access management (IAM) to prevent unauthorized entry, maintaining rigorous patch management to close vulnerabilities, and employing continuous monitoring to detect anomalous data exfiltration. Additionally, maintaining offline, immutable backups is a standard practice to ensure operational continuity in the event of a successful ransomware deployment.