Order/Invoice etc Emails
Currently there seems to be a number of spoof emails going the rounds, (July-September 2014). Still ongoing January 2015!
The Subjects (that I've already seen) include Invoice #, Statement #, Order # and even Termination #. Each is written in pretty poor English and always has an attachment with it that the message tries to con you into opening.
Don't! There's a Trojan of some sort attached, simply delete the message, preferably without viewing the email message and any images included and NEVER click on any links within the message.