A U.S. intelligence expert on Russian cyber activity said that Fancy Bear primarily works for or on behalf of the GRU, Russia’s military intelligence agency, which U.S. intelligence officials have concluded were responsible for hacks of Democratic Party databases and emails.
In spear phishing, an attacker sends targeted messages, typically via email, that exploit known information to trick victims into clicking on malicious links or open tainted attachments.
Microsoft said the attacks exploited a vulnerability in Adobe Systems Inc’s Flash software and one in the Windows operating system.
Adobe released a patch for that vulnerability on Monday, when security researchers with Google went public with details on the attack.
Microsoft chided rival Google for going public with details of the vulnerabilities before it had time to prepare and test a patch to fix them.
“Google’s decision to disclose these vulnerabilities before patches are broadly available and tested is disappointing, and puts customers at increased risk,” Microsoft said.
A Google representative declined to comment on Microsoft’s statement.
Google disclosed the flaw on Monday, following its standing policy of going public seven days after discovering “critical vulnerabilities” that are being actively exploited by hackers.
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