Date: Mon, 23 Dec 2013 07:54:35 -0800 [10:54:35 EST]
From: QuickBooks Invoice [email@example.com]
Subject: Important - Payment Overdue
Please find attached your invoices for the past months. Remit the payment by 12/23/2013 as outlines under our "Payment Terms" agreement.
Thank you for your business,
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Attached to the message is a file Invoice.zip which has a VirusTotal detection rate of 5/44, which in turn contains a malicious executable Invoice.exe with a detection rate of 5/49.
Automated analysis    shows an attempted connection to wifordgallery.com on 18.104.22.168 (Hosting Services Inc, US), it appears to be the only domain on that server so blocking the IP or domain itself may give you some protection against this current run of malware.