Threat Description



Category: Malware
Type: Virus
Platform: W32
Aliases: Den Zuk


This virus will seek out and destroy copies of the Brain virus. If it finds a Brain-infected diskette, it will remove the infection, and replace it with a copy of itself. This virus hides on track 40 on diskettes, but normally 360K diskettes only have tracks numbered 0 to 39. This virus does not infect 1.2M or 3.5" diskettes correctly, but will destroy data on them. The volume label "(c) Brain" on an infected diskette would be changed to


This is because YC1ERP is the call-sign of the author, Denny Yanuar Ramdhani.


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

On a computer infected with this virus, pressing Ctrl-Alt-Del will not result in a simple reboot. Instead the text "DEN ZUK" will appear on the screen for a fraction of a second.

Then the computer will appear to reboot, but the virus will remain in memory.

Pressing Ctrl-Alt-F5 will produce a "true" reboot.

Variant:Ohio (Hacker)

This is an older version of the Den Zuk virus and is written by the same author. Den Zuk will also remove the "Ohio" virus if it is found.

The Mardi Bros virus appears related as well.


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