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Yahoo admitted the attack “may have” impacted people outside of Europe, which is a pretty vague statement that I would interpret as “did.” So, yes, I would be somewhat concerned if I used Yahoo mail unless you use a Mac, since apparently only Windows machines were affected. Some of the malware allegedly is using infected machines to mine bitcoins, and if you are unlucky enough to be one of those, you will soon have a very, very slow PC. Make sure to keep everything patched and your anti-virus software up to date.