It said that it subsequently "intensified an ongoing broader review" that caused it to re-examine "access to the company's network by a state-sponsored actor", which it had identified in late 2014.
Then in September Yahoo dropped a cyber bombshell by admitting that certain information was stolen from at least 500 million user accounts in 2014.
In the SEC filing, Yahoo said it recorded $1 million worth of expenses related to the breach in the fiscal quarter that ended on September 30, but those expenses "did not have a material adverse impact" in that period.
Verizon vz is now mulling a $4.8 billion acquisition of Yahoo. As a result of the Security Incident, we are facing at least 23 putative consumer class action lawsuits and other lawsuits and claims may be asserted by or on behalf of users, partners, shareholders, or others seeking damages or other related relief, allegedly arising out of the Security Incident.
Confirmed by the the filing is that the forensic experts are investigating whether or not the intruder, who is possibly the same entity, created cookies "that could have enabled such intruder to bypass the need for a password to access certain users' accounts or account information". The Sunnyvale, California, company said its board is now investigating how much was known back in 2014.
In addition to possibly scuppering one of the year's biggest deals, Yahoo's huge security breach has led to a plethora of federal, legal, state, and local investigations; and 23 class action lawsuits from consumers. So this doesn't certainly mean Yahoo sees Verizon withdrawing from the deal due to the security breach as an instant risk. That said, the company has "subsequently incurred expenses" related to the hack and it expects to incur "investigatory, legal, and other expenses" associated with it in the foreseeable future, the filing points out without providing a figure.
Kirk on questioning Duckworth's American heritage: 'I'm absolutely not a racist'
The daughter of an immigrant , she said her family struggled to get by and had to use food stamps after her father lost his job. Duckworth went into the race with a substantial lead, earning 13.3 percent more than Kirk in the Real Clear polling average.
In October, Verizon was reportedly trying to knock that purchase price down to $3.8 billion instead - roughly a 20% discount, give or take a few hundred million dollars.
Yahoo blames a government for hacking into its computer network saying that its attacker was "a state-sponsored actor".
Yahoo also mentioned in the SEC filing that law enforcement on Monday had provided the company with another dataset, which a hacker claimed to contain Yahoo user account data.
"The fact that Yahoo staff knew of the breach at the time it occurred and kept quiet is completely and utterly unforgivable". But it must have shocked them because they started to reveal details about the security breach.
In its filing, Yahoo indicates that it discovered the data had been stolen after it looked into another unsubstantiated claim.
News of the breach broke as Yahoo was finalizing a deal to sell off its core business to Verizon.