Larger hacks include 3 billion Yahoo accounts compromised in a 2013 incident and credentials for more than 412 million users of websites operated by FriendFinder Networks Inc. in 2016, according to the website for Security breaches LeakedSource.com
Under Armor said it worked with data security companies and law enforcement agencies, but did not provide any information about how hackers intrude or extract data without being caught.
While the breach did not include financial data, large amounts of stolen e-mail addresses can be valuable for cybercriminals
e-mail addresses that were found during an attack in 2014 and the data of 83 million JPMorgan Chase customers Later, in pump-and-dump systems were used to US federal allegations in the case in 201
Under Armor said in a warning on its website that MyFitnessPal users need to change their passwords and They asked the users to do this immediately.
"We continue to monitor suspicious activity and coordinate law enforcement," the company said, adding that it supports systems that detect and prevent unauthorized access to user information. "Under Armor said it was on Thursday, four days after it had first heard about the incident, reported users about the breach.
Under Armor purchased MyFitnessPal in 2015 for $ 475 million. It is part of the combined fitness department of the company, whose revenue last year accounted for 1.8 percent of Under Armor's total sales of $ 5 billion.