Virus.MSWord.Mimir or Mimir is a virus that runs on Microsoft Word program.
Mimir is a very dangerous macro virus. The virus uses a destructive way of infection. Instead of copying just macro programs to infect other documents (as most of other macro viruses do), this virus overwrites whole documents while infecting them - it copies infected document to the victim ones as disk files. As a result the virus destroys original documents, and they cannot be recovered.
The virus contains one macro (Document_Open) and activates at the same moment an infected document is loaded by MS Word. The virus gets names of four last recently edited files and overwrites them. Then it searches for files with .DOC filename extension on the C: drive including subfolders, and overwrites them in the same way. As a result all documents on the C: drive may be destroyed.
To spread itself the virus also uses the MS Outlook mail and sends infected messages to the Internet. It gets all contacts from MS Outlook contacts folder and send each of them a message with attached infected document, the body of message has one line of text:
Some nice jokes you got to read!! :))
If the system date is set to April 9th 1999 the virus deletes the C:\IO.SYS file and displays the message box:
Oooops ..Sorry..MIMIR has infected your PC..