Threat Description



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


Danom viruses are proof-of-concept viruses for Microsoft Command Shell codename Monad. They do infect other Monad scripts, although there is also a cross infecter for .MSH, .BAT and .CMD files.


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


Danom.B virus infected .msh, .cmd and .bat files. If the infection marker "Candela" is not found, the virus infects by prepending its code. However .bat and .cmd infected files overwrite during infection.


This virus searches for .msh files and if such are found it looks for an infection marker "Candela". If the last is not present in the file, the virus appends its code to the victim file.


This is a small code written to overwrite .msh files with itself. It searches for such files and checks for the length. It tries to infect if the file size is different from the size of the initial infected file. However due to an error the virus infects one file per run. It infects the last file in alphabetical order, unless it is already infected.


This is similar to Danom.A but it prepends the virus code to the victim files.


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