Threat Description



Aliases: Zelu, Trojan_Zelu
Category: Malware
Type: Trojan
Platform: W32


The Zelu trojan is disguised as a 'ChipTec Y2K - Freeware Version' utility. When the trojan is run it scans all directories and corrupts all files it can open for writing.


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.

Technical Details

The trojan puts the following messages in the beginning of corrupted files:

@ This file is sick !  @ It was contaminated by the radiation liberated  @ by the explosion of the atomic bomb.   

After the trojan finishes 'scanning' the files it outputs:

@ Hello !  @ My name is ZELU.  @ I'm a virus.  @ I detonated the atomic bomb in your hard disk.  @ Good-bye !  Press ENTER to continue . . .   

After 'Enter' pressed the trojan passes control to operating system. In some cases an attacked computer is reset. By this time the operating system is not usable and has to be fully reinstalled. All data on the attacked system is lost.

If the trojan is just run, its task can be killed from Windows Task Manager. This will save most of data on a hard disk.

Here's a screenshot of the trojan:

Technical Details:Alexey Podrezov


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