A credential stuffing list containing more than 70 million unique email addresses was found on a popular hacking forum, reveals Australian researcher Troy Hunt, who runs the Have I Been Pwned data breach notification service.
The list, named Naz.API, is 104 gigabytes in size, being composed of 319 files containing email addresses and associated passwords, along with the websites they are used on.
One-third of the email addresses, Hunt discovered, had not been added to Have I Been Pwned before, meaning that they did not appear in previously known data dumps.
The reason for that, Hunt says, is that the data mainly comes from stealer logs. Specifically, from malware that harvests the information from infected machines. He also notes that the data is sourced from the defunct ‘Illicit Services’ OSINT tool and data breach search engine.
When checking the validity of the Naz.API data, Hunt discovered that the email addresses appear to be legitimate, as well as the accounts they are associated with.
The passwords, however, are likely to be old. Several Have I Been Pwned subscribers have confirmed that, for their email addresses on the list, the passwords were used in the past. Hunt also discovered one of his older passwords in the list.
“This corpus of data isn’t just stealer logs, it also contains your classic credential stuffing username and password pairs too. In fact, the largest file in the collection is just that: 312 million rows of email addresses and passwords,” Hunt notes.
The data, Hunt says, has been added to Have I Been Pwned, so that individuals can search for their email addresses to check if they have been impacted.
It was also added to Pwned Passwords, enabling users to check which of their passwords was present on the list. Both services are offered free of charge.