Do not execute programs, open files or click on links attached to or within the body of these e-mails. Delete these e-mails and if you have clicked on any art of that email and executed a program, notify your bank immediately about the fact and change all your access passwords to your bank account on another computer you can trust, or on the same one after a complete virus infection check by a reliable technician.
SPAM are unrequested e-mails sent to a large number of people, including your e-mail address, and which in most cases contain information about chain letters or requests to access a link and update your banking data or, further still, regularize your personal tax ID (CPF). The links and files attached may contain viruses that steal your personal and financial information. E-mail chain letters occur when an e-mail is sent to lots of different people the same time and occasionally passed on, spreading exponentially to reach thousand or even millions of people.
The ubiquitous chain letters are one of the most common and irritating types of spam. Whether it is a false story about a sick child needing assistance, or mystical appeals, chain letters have the common feature of encouraging the reader to pass them on. They allocate a weighting to the number of people to whom the user passes on the message, determining the proper "reward”.