Threat Description

Black Monday


Aliases: Black Monday
Category: Malware
Type: Virus
Platform: W32


The name of this virus is derived from a text string found inside it:

Black Monday 2/3/90 KV KL MAL   

It is rarely possible to restore infected .EXE files, as the virus may overwrite some bytes at the end of the file.


A 781 byte, possibly older variant, which is only able to infect COM files.


Automatic action

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


Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

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


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