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Some of the Android apps in the Google Play store were so ineffective that they detected themselves as malware.
Yahoo has now said that all of its 3 billion user accounts were affected in a hacking attack back in 2013
Yahoo has said that all of its 3 billion user accounts were affected in a hacking attack, which dates back to 2013.
The company said an investigation had shown the breach went much further than originally thought. The stolen data did not include passwords in clear text, payment card or bank account data, it added.
Previously the internet giant had said "more than one billion" of its accounts had been hit.
Yahoo said that while its latest announcement did not represent a new "security issue" it was sending emails to all the "additional affected user accounts".
The company added that it was "continuing to work closely with law enforcement".
TOP TIPS For Protecting Yourself
If you have been affected, change your password and security questions for your online accounts.
Use 3 random words to create a strong password. Numbers and symbols can still be used, however three random words is the key to creating a strong and memorable password.