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Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:Maldal.C
Technical name:W32/Reeezak.A@mm
Threat level:Low
Alias:W32/Reeezak.A@mm, Keyluc, W32/Zacker.C, Maldal, W32/Maldal.A-mm
Effects:  It displays a Flash animation on the screen. It changes the Internet Explorer home page. It changes the name of the computer and locks the keyboard. In Windows NT computers, it uses up the system’s memory.

Affected platforms:

Windows XP/2000/NT/ME/98/95

First detected on:
Detection updated on:Nov. 25, 2003
Proactive protection:
Yes, using TruPrevent Technologies
Repair utility:Panda QuickRemover

Brief Description 


Maldal.C is a worm thatreaches computers in a file called CHRISTMAS.EXE attached to an e-mail message with the subject Happy New Year.

It very easy to become infected with this worm, as it tries to pass itself of as a harmless Christmas greeting.

Maldal.C is a dangerous worm as it causes the following effects: it displays a Flash animation on the screen, changes Internet Explorer’s home page. Modifies the name of the affected computer and locks the keyboard.

Furthermore, in computers with the NT operating system, it is particularly destructive as it uses up the available memory.

Visible Symptoms 


A clear indication that you have received Maldal.C is a message with the following characteristics:

  • Subject:

Happy New Year

  • Message:

Hii , I can't describe my feelings But all I can say is Happy new year :-) bye

  • Attachments:


This file has the typical icon of Flash animation files.

When the CHRISTMAS.EXE file is run, Maldal.C displays a Flash animation on the screen: