Threat Description



Category: Malware
Type: Virus
Platform: W32
Aliases: V-Sign, Cansu, Sigalit


V-Sign is a typical boot sector virus, except that it uses slightly polymorphic encryption.


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

V-Sign infects DOS boot sectors on diskettes and Master Boot Records on hard disks. It is only able to infect a hard disk when you boot a machine with an infected diskette in drive A:. At this time the virus infects the Master Boot Record, and after that it will go resident to high DOS memory during every boot-up from the hard disk. Once V-Sign gets resident to memory, it will infect practicly all non-writeprotected diskettes used in the machine.

V-Sign doesn't preserve the original boot sector when it infects a disk. The virus activates after infecting 64 diskettes. At this time it will display a large V-shaped letter and hang the machine.


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