Threat description


Platform: W32


The name of the virus is derived from the following message found inside it.

NEWS FLASH!! Your system has been infected with the         incurable decay of LEPROSY 1.00, a virus invented by         PCM2 in June of 1990.  Good luck!


Automatic action

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

More scanning & removal options

More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.

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

Contact Support

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

Technical Details

Another variant is known, where the message has been changed to:

ATTENTION!  Your computer has been afflicted with         the incurable decay that is the fate wrought by         Leprosy Strain B, a virus employing Cybernetic         Mutation Technology(tm) and invented by PCM2 08/90. 		 		

Infected programs will either display this message or

Program too big to fit in memory  

Leprosy is a 666 byte overwriting virus, and infected programs must be deleted, as there is no way to remove the virus. The only thing which is remarkable about it is the fact that the virus is written in C.

Variant:Plague, Viper, Busted

Plague is a slightly shorter variant, 591 bytes long. It contains the following text:

 Autopsy indicates the cause of          death was THE PLAGUE          Dedicated to the dudes at SHHS          VIVE LE SHE-MAN! 		  		 

Viper is related, but uses a slightly different encryption method and is 840 bytes long. Busted is yet another variant, which contains the text



This variant has been changed quite a bit, probably in order to avoid detection by some anti-virus program. It is also longer - 1972 bytes.

Variant:Leprosy-C, Leprosy-D, Scribble, Seneca, Surfer

Other variants, just as non-interesting as the previous ones.


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