Welcome to the Virus Encyclopedia of Panda Security.
It disables certain Word options and modifies documents that are used
Melissa.O is a macro virus that reaches computers in an infected Word 97 document (a file with a DOC extension), included in an e-mail message which is very easy to recognize as it refers to the Argentinian president Duhalde:
This virus spreads very quickly as it sends itself out automatically to the first one hundred addresses found in the Outlook Address Book.
Melissa.O has no destructive effects. It simply disables some Word options and modifies open documents (under certain circumstances).
A clear indication that Melissa.O has arrived to the system is if you receive the following e-mail message:
Melissa.O inserts a blank space in open documents.
In fact, this space is inserted in the place where the cursor is located. This only takes place when the minutes value (in the system clock) plus 2 equal the day value plus 1: Minutes + 2 = Day + 1.
However, if there is something selected or highlighted at that precise moment, this will be deleted from the document.
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