NTT Docomo, Japan’s largest mobile carrier, announced that it is working to restore services following a cyberattack that temporarily disrupted its operations on Thursday. The Tokyo-based company confirmed that a distributed denial-of-service (DDoS) attack targeted its systems, flooding its network with junk traffic and rendering several services unavailable.
Extent of the Disruption
From early Thursday morning until late afternoon, local users reported being unable to access multiple NTT Docomo services, including:
- The company’s news website.
- Its video streaming platform.
- Mobile payment and webmail services.
- A website dedicated to golf enthusiasts.
By late afternoon, the company reported that access to most services had been restored, although it acknowledged that some content updates might still experience delays.
No Attribution Yet
NTT Docomo has not attributed the attack to any specific threat actor. However, this is not the company’s first experience with cybercrime. In 2023, NTT Docomo fell victim to a ransomware attack claimed by the notorious Ransomed.vc group. At the time, Ransomed.vc stated it was planning to shut down operations following the alleged arrest of six affiliates.
A Surge in Cyberattacks on Japanese Companies
NTT Docomo is the latest in a growing list of Japanese companies targeted by cyberattacks in recent months. The incidents span a wide range of industries, reflecting the increasing threat landscape for businesses in Japan.
Notable Recent Incidents
Japan Airlines (JAL):
- In December, JAL reported disruptions in both domestic and international flights due to a “surge in traffic,” which the company indicated may have been a DDoS attack.
Mitsui Sumitomo Insurance:
- Last month, a breach at a third-party vendor exposed personal data belonging to thousands of policyholders.
Kadokawa Corporation:
- The manga, anime, and video game giant reportedly paid nearly $3 million to the Russia-linked ransomware group BlackSuit following a data breach.
Casio:
- In October, a ransomware attack delayed customer deliveries, with the Underground ransomware gang claiming responsibility.
Other Targeted Companies:
- Nidec: Electric motor manufacturer.
- Yorozu: Automotive parts supplier.
- Monohakobi: Research and development organization.
- Major Banks: Mitsubishi UFJ Bank, Resona Bank, and Mizuho Bank all faced disruptions in internet banking services, reportedly due to cyberattacks.
Japan’s Vulnerability to Cyber Threats
The recent wave of cyberattacks highlights Japan’s growing vulnerability to digital threats. With its advanced technology infrastructure and globally connected economy, Japan has become an attractive target for threat actors, including ransomware gangs and state-sponsored groups.
The uptick in attacks underscores the need for Japanese companies to bolster cybersecurity measures, enhance threat detection capabilities, and collaborate with government agencies to address the rising threats.
Moving Forward
As NTT Docomo works to fully restore its services, the incident serves as yet another reminder of the evolving cyber threat landscape. Japan’s businesses and critical infrastructure providers must remain vigilant, as the frequency and sophistication of cyberattacks show no signs of slowing down. This latest attack is a stark warning of the importance of proactive measures to protect sensitive systems and data from adversaries.
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