Massive Data Leak at Japanese Consultancy Firm Toumei Exposes 100M+ Records

📅 Date of Breach

October 2023

🏢 Company Overview

Company Name: Toumei
Industry: Consultancy
Headquarters: Japan

Toumei is a prominent consultancy firm in Japan, offering a range of business advisory services to companies across various sectors.

🔍 Breach Details

Type of Breach: Data Leak
Date of Discovery: October 2023
Data Exposed:
- Over 100 million lines of data
- 10GB in total size
- 77,000 unique email addresses
- Names
- Phone numbers
- Physical addresses

A threat actor under the alias USDoD on BreachForums disclosed this information, making it available for download. The post mentions the data was made public on October 23, 2023.

👤 Threat Actor Profile

Alias: USDoD
Platform: BreachForums
Reputation: 881 (on BreachForums as of October 2023)
Activity: Known for leaking databases and other sensitive information. Active on cybercrime forums since at least July 2023.

💥 Impact Analysis

Affected Individuals: Potentially tens of thousands due to the 77,000 unique email addresses listed.
Potential Consequences:
- Identity Theft: Exposure of personal information could lead to identity theft.
- Phishing Scams: With emails, phone numbers, and addresses leaked, targeted phishing campaigns are likely.
- Reputational Damage: The breach may erode trust in Toumei, impacting its business operations.

🛡️ Prevention Tips

For Affected Individuals:
- Monitor email and phone activity for any suspicious communication.
- Consider changing passwords and using two-factor authentication (2FA).
- Be cautious of phishing attempts.
For Companies:
- Regularly update and patch systems to fix security vulnerabilities.
- Encrypt sensitive data both at rest and in transit.
- Implement comprehensive employee cybersecurity training programs.