Number overview
050-3801-3651 has accumulated 110,000+ lookups on phone-number search sites and is reported as a number used to relay two-factor authentication codes. It is suspected of being misused to relay codes stolen through phishing.
Reported tactics
- The attacker uses login credentials entered at a phishing site to attempt login at the real site
- The two-factor code sent from the real site is forwarded to the victim through this number
- If the victim enters the code, the attacker gains access to the account
If a two-factor code arrives from this number while you are not actively logging in, a third party is likely attempting unauthorized access to your account.
How to handle this
Ignore unexpected codes
If a code arrives when you didn't initiate a login, it's an unauthorized-access attempt. Don't enter the code; change your password immediately.
Where to report or get help
- The support desk of the service in question
- IPA Safe Consultation Desk: 03-5978-7509