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What you should do if you get an email attachment from someone you don't know, an email from a business asking for your account information, or a weird attachment from someone you know.
What is...
Without question or hesitation you should delete it.
Do not click on the attachment out of curiosity. Clicking on the attachment will start the virus program IF there is one in the attachment.
If you get a weird attachment link from a friend/family member you know, you should call that person to ask if they sent it. If they did not send that attachment, delete it.