3 Years Later: zioncastle.com.tw Leak of 18,359 Surfaces

A combolist titled "zioncastle.com.tw" carries a leak date of 18 January 2023, but HEROIC only identified it circulating on Telegram recently. The file contains 18,359 records of email addresses, plaintext passwords, and associated URLs tied to the domain zioncastle.com.tw.

Why This Is Dangerous

A multi-year gap between when data was actually stolen and when it resurfaces publicly doesn't make it safer, it often means the credentials have already changed hands quietly among criminals before reaching wider circulation. If any of these 18,359 accounts never changed their password since 2023, they remain just as exposed today as the day the data was taken.

What Was Exposed

The "zioncastle.com.tw" combolist contains:

• Email addresses (zioncastle.com.tw-associated)
• Plaintext passwords
• Associated URLs

Why This Matters

Old credentials are still dangerous credentials if they were never changed. Attackers use domain-specific combolists like this one to attempt account takeover on the original site and, since password reuse is common, on other services too, which can lead to financial fraud and identity theft well after the original incident.

How This Combolist Was Built

Combolists organized around a single domain are typically created by filtering a larger breach collection down to just the credentials tied to that site, then re-circulating the file, sometimes years after the original theft, whenever a new buyer or Telegram channel picks it up. This delayed resurfacing is common and one reason breach data keeps causing harm long after it was first taken.

Check If You Are Affected

Even years-old exposures are worth checking, especially if you never changed your password. HEROIC's free breach scanner searches more than 400 billion leaked records, including this combolist, so you can find out if you're one of the 18,359 affected accounts.