The scam claimed to come from Google Docs - a service that allows people to share and edit documents online.
Users who clicked a link and followed instructions, risked giving the hackers access to their email accounts.
Google said it had stopped the attack "within approximately one hour", including through "removing fake pages and applications".
"While contact information was accessed and used by the campaign, our investigations show that no other data was exposed," Google said in an updated statement.
