Welcome to the Virus Encyclopedia of Panda Security.
Navidad.B is an astute worm that is difficult to detect because it reaches computers in a reply to a previously sent e-mail (which is infected). This message includes a file called EMANUEL.EXE, which infects the computer when it is run.
Navidad.B is dangerous as it prevents many programs from being run. In other words, files with an EXE extension. It also displays warnings when the computer is started up and goes memory resident as a task.
It spreads very quickly by sending itself as a reply to all the e-mail messages in the Inbox of the mail program.
The first symptom of Navidad.B is an e-mail message with the following characteristics:
When the EMANUEL.EXE file is run, Navidad.B activates and displays a long list of icons and messages. These appear depending on how the infected user replies to each one.
For more information on the windows displayed when Navidad.B activates, click here.