Classification

Category: Malware

Type: Virus

Aliases: Mr_D, Mr. D

Summary


This virus infects on file execution all the files that contain 'MZ' in their first two bytes. It pads the infected files to a paragraph boundary, thus adding up to 15 additional bytes of garbage to them.

Removal


Automatic action

Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.

Knowledge Base

Find the latest advice in our Community Knowledge Base.

About the product

See the manual for your F-Secure product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

Technical Details


Mr. D will not infect files with internal overlay structure. It will also not infect files with "VIR" in their name

After infecting a file, Mr. D attempts to delete a file with the same name and the first character of the extension replaced by '_'. The virus sets the seconds field in the infected files time-stamp to 4.

The virus contains routines to play with the screen and which are activated on 31st of any month, some time after the virus is installed in memory. Mr. D does not spread before March 18, 1993.

The virus contains the string "Mr. D" unencrypted.

There are two variants.