Welcome to the Virus Encyclopedia of Panda Security.
|Effects: ||It deletes the files the computer needs in order to work correctly.
|First detected on:||July 2, 2002|
|Detection updated on:||June 3, 2003|
|Country of origin:||CHILE|
Grade.A is a worm that reaches computers with another virus called Grade. Grade.A carries out the actions that Grade needs in order to be able to spread via e-mail.
Grade.A is considered a dangerous worm, as it deletes files needed for the correct functioning of the computer.
When the infection has been carried out, both viruses send themselves out to all the contacts in Outlook’s Address Book.
Grade.A is difficult to identify, as it reaches computers in an e-mail message with variable characteristics.
For information about the possible characteristics of the message carrying Grade.A, click here.
In addition, Grade.A does not display any messages that indicate that it has infected a computer until it has carried out its destructive actions. After doing this, it displays the following error message: