Threat Description



Category: Malware
Type: Virus
Platform: W32
Aliases: Virdem


This virus was written in 1986, which makes it one of the oldest viruses in existence. It was written by R. Burger, the author of "Computer Viruses: A High-Tech Disease". It is not a threat in unmodified form, as the virus makes it quite clear that the program has been infected. Virdem overwrites the first part of the program and appends the original code to the end of the file. Two similar variants of this virus are known - one with all the text strings in German, but the other is an English language version.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details


This variant is of the same length as the original, but the text messages have been changed.

Variant:Virdem 792, Virdem 824

Two shorter variants, possibly created by removing the text messages, or they might be earlier variants of the virus.


Suspect a file or URL was wrongly detected? Submit a sample to our Labs for analysis

Submit Now

Give And Get Advice

Give advice. Get advice. Share the knowledge on our free discussion forum.

Learn More