Atmeltomo Data Breach

What happened

In April 2021, "Japan's largest e-mail friend search site" Atmeltomo suffered a data breach that was later sold on a popular hacking forum. The breach exposed 1.3M records with 580k unique email addresses along with usernames, IP addresses and unsalted MD5 password hashes.

Exposed data

Recommended actions

• Change your Atmeltomo password immediately, and update it anywhere you reused the same password.
• Enable two-factor authentication on the affected account and on your critical services (email, banking).
• Watch for targeted phishing emails referencing Atmeltomo — attackers weaponise breach data quickly.
• Check whether your email address appears in this breach on haveibeenpwned.com.