0x32

Nearly 71 million unique credentials stolen for logging into websites such as Facebook, Roblox, eBay, and Yahoo have been circulating on the Internet for at least four months, a researcher said Wednesday. Troy Hunt, operator of the Have I Been Pwned? breach notification service, said the massive amount of data was posted to a well-known underground market that brokers sales of compromised credentials. Hunt said he often pays little attention to dumps like these because they simply compile and repackage previously published passwords taken in earlier campaigns. Post appearing on breach site advertising the availability of naz.api password data. Not your typical password dump Some glaring things prevented Hunt from dismissing this one, specifically the contents indicating that nearly 25 million of the credentials had never been leaked before: 319 files totaling 104GB 70,840,771 unique email addresses 427,308 individual HIBP subscribers impacted 65.03 percent of addresses already in HIBP (based on a 1,000 random sample set) “That last number was the real kicker,” Hunt wrote. “When a third of the email addresses have never been seen before, that's statistically significant. This isn't just the usual collection of repurposed lists wrapped up with a brand-new bow on it and passed off as the next big thing; it's a significant volume of new data. When you look at the above forum post the data accompanied, the reason why becomes clear: it's from ‘stealer logs’ or in other words, malware that has grabbed credentials from compromised machines.” Further Reading A redacted image that Hunt posted showing a small sample of the exposed credentials indicated that account credentials for a variety of sites were swept up. Sites included Facebook, Roblox, Coinbase, Yammer, and Yahoo. In keeping with the claim that the credentials were collected by a “stealer”—malware that runs on a victim’s device and uploads all user names and passwords entered into a login page—the passwords appear in plaintext. Account credentials taken in website breaches are almost always cryptographically hashed. (A sad aside: Most of the exposed credentials are weak and would easily fall to a simple password dictionary attack.) Screenshot showing a sample of 20 credential pairs, with usernames redacted. Have I Been Pwned? Data collected by Have I Been Pwned indicates this password weakness runs rampant. Of the 100 million unique passwords amassed, they have appeared 1.3 billion times.