Biggest Digital Break: Yahoo hacker steals personal info from at least 500M accounts

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SAN FRANCISCO (AP) — Computer hackers swiped personal information from at least 500 million Yahoo accounts in what is believed to be the biggest digital break-in at an email provider.

The massive security breakdown disclosed Thursday poses new headaches for beleaguered Yahoo CEO Marissa Mayer as she scrambles to close a $4.8 billion sale to Verizon .

The breach dates back to late 2014, raising questions about the checks and balances within Yahoo — a fallen internet star that has been laying off staff and trimming expenses to counter a steep drop in revenue during the past eight years.

At the time of the break-in, Yahoo‘s security team was led by Alex Stamos, a respected industry executive who left last year to take a similar job at Facebook.

Yahoo didn’t explain what took so long to uncover a heist that it blamed on a “state-sponsored actor” — parlance for a hacker working on behalf of a foreign government.

The Sunnyvale, California, company declined to explain how it reached its conclusions about the attack for security reasons, but said it is working with the FBI and other law enforcement. Yahoo began investigating a possible breach in July, around the time the tech site Motherboard reported that a hacker who uses the name “Peace” was trying to sell account information belonging to 200 million Yahoo users.

Yahoo didn’t find evidence of that reported hack, but additional digging later uncovered a far larger, allegedly state-sponsored attack.

“We take these types of breaches very seriously and will determine how this occurred and who is responsible,” the FBI said in a Thursday statement.

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MOST ACCOUNTS EVER STOLEN

The Yahoo theft represents the most accounts ever stolen from a single email provider, according to computer security analyst Avivah Litan with the technology research firm Gartner Inc.

“It’s a shocking number,” Litan said. “This is a pretty big deal that is probably going to cost them tens of millions of dollars. Regulators and lawyers are going to have a field day with this one.”

Yahoo says it has more than 1 billion monthly users, although it hasn’t disclosed how many of those people have email accounts. In July, 161 million people worldwide used Yahoo email on personal computers, a 30 percent decline from the same time in 2014, according to the latest data from the research firm comScore.

The data stolen from Yahoo includes users’ names, email addresses, telephone numbers, birth dates, scrambled passwords, and the security questions — and answers — used to verify an accountholder’s identity. The company said the attacker didn’t get any information about its users’ bank accounts or credit and debit cards.

Security experts say the Yahoo theft could hurt the affected users if their personal information is mined to break into other online services or used for identity theft. All affected users will be notified about the theft and advised how to protect themselves, according to the company.

Yahoo also is recommending that all users change their passwords if they haven’t done so since 2014. If the same password is used to access other sites, it should be changed too, along with any security questions similar to those used on Yahoo.

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THE VERIZON IMPACT

News of the security lapse could cause some people to have second thoughts about relying on Yahoo’s services, raising a prickly issue for the company as it tries to sell its digital operations to Verizon.

That deal, announced two months ago, isn’t supposed to close until early next year. That leaves Verizon with wiggle room to renegotiate the purchase price or even back out if it believes the security breach will harm Yahoo’s business. That could happen if users shun Yahoo or file lawsuits because they’re incensed by the theft of their personal information.

Verizon said it still doesn’t know enough about the Yahoo break-in to assess the potential consequences. “We will evaluate as the investigation continues through the lens of overall Verizon interests, including consumers, customers, shareholders and related communities,” the company said in a statement.

DELAY OF SALE?

At the very least, Verizon is going to need more time to assess what it will be getting into if it proceeds with its plans to take over Yahoo, said Scott Vernick, an attorney specializing in data security for the law firm Fox Rothschild.

“This is going to slow things down. There is going to be a lot of blood, sweat and tears shed on this,” Vernick said. “A buyer needs to understand the cybersecurity strengths and weaknesses of its target these days.”

Investors evidently aren’t nervous about the Verizon deal unraveling yet. Yahoo’s stock added a penny Thursday to close at $44.15. But the Verizon sale represents a sliver of Yahoo’s total market value, which primarily consists of a stake in Chinese e-commerce leader Alibaba Group currently worth $42 billion.

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AP Technology Writer Bree Fowler in New York contributed to this story.

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