Over the past couple of weeks, there has been a huge number of emails sent out as part of a phishing scam involving ACH and FDIC. Below are what the emails read (they may change over time):

Subject: FDIC notification
From: no.reply@fdic.gov
Message: Dear customer,
Your account ACH and WIRE transaction have been temporarily suspended for security reasons due to the expiration of your security version. To download and install the newest installations read the document(pdf) attached below.

As soon as it is setup, you transaction abilities will be fully restored.
Best Regards, Online Security departament, Federal Deposit Insurance Corporation.

Subject: ACH Payment 2318207 Canceled
From: account.manager@nacha.net
Message: ACH Payment Canceled

The ACH transaction (ID: 51800395),
recently initiated from your checking account (by you or any other person),
was canceled by the other financial institution.

Rejected transaction
Transaction ID: 8574210513218
Reason for rejection: See details in the attachment
Transaction Report: report_082011-65.pdf.exe (self-extracting archive, Adobe PDF)

13450 Sunrise Valley Drive, Suite 100 Herndon, VA 20171 (703)561-1100 2011 NACHA – The Electronic Payment Association

These emails contain an attachment. Do *NOT* download or open this file. It will install a variant of the Zeus or ZBot trojan on your system. They aim for account information, mostly regarding banking. Again, if you receive an email do not open the attachment. If your email provider allows you to mark it as a phishing email, do so and then delete it (if it hasn’t been already).